Yahoo!, Yahoo!, what did you do?

While I busy myself composing a nursery rhyme about Yahoo!'s deadly warning of an hour ago, I'm looking at the red numbers on my monitor. (What rhymes with "Project Panama"? Ooh, I can just rhyme with "unforeseen delay.") Yep, Yahoo! Inc. (NASDAQ:YHOO) is not looking good, down $3.57, or 12.3%, and flirting with its 52-week low of $24.91. Google Inc. (NASDAQ:GOOG) down 4%, or $16.54, to $398.15 (break on through to the other, other side!). eBay investors are slamming their portfolios, too, selling off eBay to the tune of a drop of 82 cents, or 3%, to $26.02.

Yahoo!'s position as bellwether certainly has a storied history; I remember oh-so-well those heady days in early 1999 when I sat in Jeremy Siegel's finance class at Wharton and watched Yahoo! soar to ever-dizzier-heights, rising and falling $100, $200 a share in a single day. It was crazy, and the company always lead the market. That was long before the advent of a public Google; and it's interesting to see how Google and Yahoo! are interacting now that the two of them share a sector on the NASDAQ.

Yahoo! is to blame, that's for sure. It's the company's failure to grab revenue from the ever-luscious but hard-to-handle local classifieds. It's the terrifically unreliable growth. More than anything, it's the "confusion and delay" caused by the unknown future of Project Panama.

It's all Yahoo!'s fault.

Apple was plugging along today, basking in the glow of its new (and black) MacBook, and Steve Jobs was probably patting himself on his back after yesterday's lovely write-up in the Wall Street Journal. I'm so smart, he was probably thinking, those naysayers just wish they'd invested in Apple way back when!

And then. Everybody started selling. Before MacBook could rack up its nth sale (rumored to be good even by Apple's projections), before Jobs could reach around for that acrobatic back pat, the market had hammered APPL to the tune of $2.08 -- a whopping 3.19%. The stock ended the day at $63.18.

Despite the sell-off, reviewers can't say enough good about the MacBook; MacWorld said it was faster than the fastest iBook G4 in almost all of its tests. And Forbes went raving on about the new Manhattan Apple store (in a historically dank and failure-ridden space, however). So why the big sell-off? Could it be a side-effect of bad news at rival Dell? If you sold today, what were you thinking?