One of my favorite Jim Cramer-isms is "Commandment No. 5" -- Tips are for waiters. Here's what he writes:

You know that the best moves are takeovers and you are convinced that if you can catch one, it will make up for all the bum steers and bad bets you have made. Tips are winning lottery tickets in most people's eyes.

That's the reason I've had to default to a simple analogy, tips are for waiters, to remind myself how stupid tips really are. Does it occur to you, on hearing the tip, that if the person telling you that Nokia is going to buy RIM really knows that's going to happen, the person is an insider and is breaking the law, and you could get in trouble, too? Does it occur to you that if the person isn't an insider, he doesn't know? There simply is no way a tip like that can work. Leave it for the waiter.

That's what investors should be keeping in mind as they watch shares of E*Trade (NASDAQ: ETFC) surge on extraordinarily vague takeover rumors. Shares were up as much as 25% on rumors that Schwab and Ameritrade were interested in buying the beleaguered broker. Where did these rumors come from? Ah, yes. "A source." And who's to say that "the source" isn't some clown holding a ton of E*Trade shares that he needs to get rid of -- for 25% more than they were trading before the rumor?

Everyone knows E*Trade could be in play -- any time a stock tanks that much, there are always going to rumors. But no one really knows what's going on, and buying E*Trade on the rumor is just mindless speculation.

As Doug McIntyre wrote, "E*Trade may be worth over $5, but it could also be worth a lot less."

Since its upside surprise when it reported last quarter, enterprise software giant Oracle Corp. (NASDAQ: ORCL) has continued with its philosophy of growth through acquisition by acquiring LODESTAR Corp., which supplies software solutions to utilities, as well as product lifecycle management leader Agile Software Corp. (NASDAQ: AGIL). And the share price has been trending upward the past three months.

But it hasn't all been peaches and cream. Billionaire George Soros recently shifted his focus away from Oracle and some other tech stocks in favor of Microsoft Corp. (NASDAQ: MSFT). BloggingStocks contributor Georges Yared thinks Oracle's glory days, in terms of growth, may be behind it, and even that it may be a stock for suckers.

Oracle's rivalry with Germany-based SAP AG (NYSE: SAP) continues, of course, not only in the courtroom -- Oracle recently added copyright infringement to its theft charges against SAP -- but also into small and medium-sized companies, where some early indicators suggest Oracle may have the edge. Oddly enough, there has been speculation that Oracle may try to acquire SAP, unlikely though that may be, after it was rumored that Oracle has been purchasing SAP stock.

But Oracle remains part of the Fortune 500, and BloggingStocks contributor Brent Archer thinks the stock might be a bargain. One analyst upgraded Oracle just last week. According to Thomson Financial, Wall Street consensus rates ORCL a buy (12 strong buy, 11 buy, 12 hold). When Oracle reports earnings on June 26, analysts expect earnings per share for this quarter to come in at 35 cents, compared to 25 cents actual from last quarter, and 25 cents a year ago. Its market cap is $96.8 billion, and its P/E ratio is 18.95 (the industry average is 23.49). The consensus price target is $21.25; the 52-week low was $13.77 in July of 2006 and $19.95 last week. It closed Tuesday at $19.88.