Online marketing specialist ValueClick (VCLK) is scheduled to unveil its fourth-quarter earnings after Tuesday's closing bell. Ahead of the announcement, analysts surveyed by Thomson Reuters are anticipating a profit of 23 cents per share, on average, which would represent an improvement over ValueClick's year-ago earnings of 18 cents per share.

ValueClick has a strong history in the earnings spotlight, having surpassed analysts' bottom-line expectations in each of the past four quarters. However, a quick scan of the stock's sentiment backdrop reveals a nearly palpable pessimism among both traders and analysts.

Bellwether technology company Cisco Systems (CSCO) reported second-quarter profit fell, although it still topped analysts forecasts. Net income sank 18% to $1.5 billion or 27 cents a share, from $1.9 billion or 32 cents a year ago, as reported in the New York Times.

Revenue climbed 6% to $10.4 billion from $9.8 billion in the quarter a year ago.

On an adjusted basis, income was 37 cents a share, beating Thomson Reuters forecast of 35 cents a share on revenue of $10.24 billion.

Tyson Foods (TSN) is on the front line of food inflation. While the Federal Reserve holds that inflation is just 2%, Donnie Smith, CEO of Tyson said that "domestic food inflation will likely overtake U.S. government forecasts as crop and animal feed prices continue to rise," The Wall Street Journal reported.

Last week, Tyson reported a profit of $298 million for the quarter to Jan. 1, compared with $160 million a year ago. Per share earnings rose to 78 cents from 42 cents. Revenue was up 15% to $7.6 billion.

Shares of Patriot Coal (PCX) surged to a new annual high of $27.54 right out of the gate Tuesday, as traders cheered the energy issue's latest quarterly report.

Patriot announced that its fourth-quarter net profit dwindled 33% to $7.3 million, or 8 cents per share, from its year-ago results of $10.9 million, or 12 cents per share. Revenue for the quarter climbed 5% to $528.2 million, but selling and administrative expenses swelled 35% to $14 million. Likewise, Patriot's operating cost per ton increased 9.5% to $55.70.

Juniper Networks (JNPR) is on the upswing, with the stock catching a 6% boost Wednesday morning on the heels of a well-received fourth-quarter earnings report. Juniper reported a quarterly profit of $190.2 million, or 35 cents per share, substantially improved from its year-ago results of $22.9 million, or 4 cents per share. Excluding items, earnings improved to 42 cents from 32 cents per share on a year-over-year basis.

Meanwhile, revenue for the quarter increased 26% to $1.19 billion. Gross margin retreated slightly, falling to 66.6% from 67.1%.

Blue-chip burger baron McDonald's (MCD) was in focus Monday morning after the company unveiled its fourth-quarter earnings. The fast-food chain reported net income of $1.24 billion, or $1.16 per share, slightly improved from its year-ago profit of $1.22 billion, or $1.11 per share. Revenue for the quarter climbed 4% to $6.21 billion.

The fourth-quarter results were more or less in line with Wall Street's expectations, but the same can't be said of its December sales. Global same-store sales rose 3.7% across the board, led by an 8.9% gain in the Asia-Pacific, Middle East and Africa (APMEA). U.S. same-store sales increased 2.6% in December, while sales at restaurants open at least 13 months declined 0.5% in Europe.

LeapFrog Enterprises (LF) plummeted more than 25% this morning, after the company warned that its full-year earnings will fall below Wall Street's expectations. The maker of educational toys expects to bank a profit of 3 cents to 6 cents per share for fiscal 2010, way below analysts' consensus estimate of 28 cents per share.

"After a solid start to the holiday season, demand softened late in the quarter relative to our expectations," explained CEO Bill Chiasson. "While sales of interactive reading products continued to grow at retail, the growth was less than we had forecasted and contributed to lower earnings growth than expected."

KB Home (KBH) is ending the week on a high note, after the homebuilder comfortably surpassed Wall Street's fiscal fourth-quarter earnings expectations. Bright and early Friday morning, KBH announced quarterly net income of $17.4 million, or 23 cents per share, on revenue of $451 million. Adjusted housing gross margins improved to 19.7% from 19%.

This marks KBH's first quarterly profit, without the aid of tax gains, in almost four years. Analysts were anticipating KBH to swallow a deficit of 17 cents per share on revenue of $441.3 million, so these results definitely qualify as a positive surprise.

Green Mountain Coffee Roasters (GMCR) has taken a drastic dive, with the stock staging a bearish gap with the sound of Friday's opening bell. Thursday night, the company unveiled its fiscal fourth-quarter results, and also confessed to a disappointing outlook for the first quarter.

Specifically, Green Mountain said it banked a fourth-quarter profit of $27 million, or 20 cents per share, up from its year-ago earnings of $14.1 million, or 12 cents per share. Sales for the quarter climbed 73% to $373.1 million. The results fell roughly in line with Wall Street's expectations, which called for a profit of 20 cents per share on revenue of $359.2 million.

Diamond Foods (DMND) was on the upswing Thursday, as traders cheered the company's latest earnings report. Diamond said it banked a fiscal first-quarter profit of $14.2 million, or 64 cents per share. Excluding items, earnings arrived at 65 cents per share, while revenue increased 40% to $252.6 million.

The results comfortably exceeded Wall Street's expectations, which called for a profit of 60 cents per share on revenue of $239.8 million.

Lululemon Athletica (LULU) will take its turn in the earnings confessional bright and early tomorrow morning, Dec. 9. Analysts are expecting the athletic apparel firm to report a third-quarter profit of 25 cents per share, up from 20 cents per share in the year-ago period. LULU has an impressive track record in the earnings spotlight, having exceeded Wall Street's consensus profit expectations in each of the past four quarters.

The stock has also established itself as a technical outperformer, with LULU rising 82.5% so far in 2010. This impressive ascent has been underlined by reliable support at the stock's 10-week, 20-week, and 50-week moving averages, which have guided LULU higher since July 2009.

Late Wednesday, DryShips (DRYS) reported that its third-quarter profit climbed 57% to $49.3 million, or 18 cents per share, while revenue increased 1.5% to $225.5 million.

On an adjusted basis, earnings for the quarter arrived at 38 cents per share. Operating margin improved to 48% from 40.4%. The results surpassed analysts' expectations, which called for a profit of 25 cents per share on $217 million in revenue.

Suntech Power (STP) is taking a post-earnings plunge, as traders pan the company's third-quarter report.

Wednesday morning, Suntech said its third-quarter profit climbed 11% to $33.1 million, or 18 cents per American depositary share (ADS), while revenue rose 57% to $743.7 million. Gross margin for the quarter contracted to 16.4% from 17.8%, due to lower selling prices.

While investing can be as complicated as you'd like to make it (stochastics anyone? perhaps collateralized debt obligation swaps instead?), the basics are very simple, especially for stock investors. Here are a few questions you can consider before buying or selling any stock.

1. Does the company sell anything? Laugh all you want, but this one question (and its answer) can save you lots and lots of money ... and grief. If you look at most biotech companies, they don't sell anything except hope. They have no revenues, but their stories are fantastic. Investors can get carried away with the promise (not the revenues or profits) of these sometime miracle producers. Most often, the promise turns to pffffft; the stock goes to zero. If a company doesn't have revenues, it doesn't mean you don't buy it (though you should have very good reasons), it only means you buy very little of it ... if you must, and you can't help yourself, and you've temporarily lost your investing compass.