Apple, Inc. (AAPL) was down at the time of this writing. The shares were off by 3.7% to $332.77. Volume was heavy.

The 52-week low for the stock is $199.25; the 52-week high is $364.90. The one-year chart still looks pretty good, but obviously anything can happen at this point. There's no real way to predict how deep the overall sell-off will get.

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?