eBay (EBAY), which competes with other e-commerce sites like Amazon.com (AMZN), Walmart (WMT), Overstock.com (OSTK), and Blue Nile (NILE), recently held an Investor Day in which the company discussed future growth areas and presented its business outlook through 2013. One notable highlight of the presentation was the company's expectation of rapid growth from its PayPal, Bill Me Later and StubHub businesses.

Here we examine eBay's growth areas in detail and the potential upside that it could add to our $32.81 stock price estimate, which stands slightly below market price.

Here are some highlights from this past week's earnings coverage from BloggingStocks:

• Advance Auto Parts Inc. (NYSE: AAP) lowered its Q3 earnings forecast below analysts' estimates.
• Advanced Medical Optics Inc. (NYSE: EYE) lowered guidance led to an analyst's downgrade.
• Alcoa Inc. (NYSE: AA) fell well short of Q3 estimates on lower demand and falling prices.
• Bank of America Corp. (NYSE: BAC) Q3 profits fell more than estimated, and it cut its dividend.
• Brunswick Corp. (NYSE: BC) forecast a full-year loss and accelerated layoffs.
• Costco Wholesale Corp. (NASDAQ: COST) Q4 earnings just missed estimates thought revenues were up.
• Dollar Tree Inc. (NASDAQ: DLTR) earnings results and growth prospects impressed one analyst.
• eBay Inc. (NASDAQ: EBAY) earnings may be diluted by its acquisition of Bill Me Later.
• Ecolab Inc. (NYSE: ECL) earnings prospects led to an analyst's downgrade.
• General Electric Co. (NYSE: GE) results were in line with low expectations, and dividends will be sustained.
• General Mills Inc. (NYSE: GIS) earnings prospects for 2009 impress Jim Cramer.
• Host Hotels & Resorts Inc. (NYSE: HST) Q3 earnings tumbled while revenue slipped.
• IBM Corp. (NYSE: IBM) surprised Wall Street by offering strong Q3 preliminary results.

According to a report from the 451 Group, the third quarter was horrible for tech M&A. With the financial crisis, it's tough to get buyers interested in deals.

But, today we got some relief; that is, eBay (NASDAQ: EBAY) agreed to shell out $820 million in cash for Bill Me Later. In fact, the company also paid $390 million for bilbasen.dk, which is a leading classifieds operator in Denmark.

At the same time, eBay plans to slash 10% of the workforce (amounting to about 1,000 employees). With an impending global recession, the environment is likely to be pretty bad for consumer platforms.

Thus, with the Bill Me Later transaction, there may be some traction -- especially with the PayPal business. But again, eBay will need to demonstrate skill with integration (which can be particularly tough in the tech world). Besides, eBay's M&A track record has been spotty, specially since its Skype deal.

Bill Me Later will certainly be costly. While the company is growing quickly, its revenue is only $150 million. Besides, the deal will dilute eBay's 2009 earnings by 6 cents to 13 cents per share. Also, might the credit crunch result in some problems for Bill Me Later?

More importantly, eBay announced that revenue will be at the low end of its forecast for Q3. In other words, the company realizes it needs to make some big moves to keep up the momentum.

Tom Taulli is the author of various books, including The Complete M&A Handbook and The Edgar Online Guide to Decoding Financial Statements. He is also the founder of BizEquity, a valuation website

Amazon.com (NASDAQ: AMZN) has always been at the forefront of making purchasing from its ubiquitous website as easy as possible. From the early days of one-click shopping, the retailer has made the process of buying merchandise super easy.

Well, it just got easier for those who want to purchase products but have no desire to pay for them immediately.

The world's largest e-tailer signed an agreement with Bill Me Later Inc. to let customers purchase products and be billed for them at a later date. In an interesting twist, Amazon.com also purchased an equity stake in Bill Me Later as well, although the size of the stake is not known.

With the enormous reach of Amazon.com has, is this payment alternative needed? From an economic standpoint, yes. Any payment avenue Amazon.com offers just makes it that much easier to increase sales to a contingent of customers who want a huge array of payment options (for better or worse). The Bill Me Later deal is expected to close in the first quarter of 2008 and should be available as a payment option at Amazon.com shortly thereafter.