Regardless of the price drop, it's still waaaaaaaaaay too expensive. Here in Canada the price dropped to about $550 (from $700) for the 60Gb PS3. That's still almost $300 more expensive than the Wii (@ $275).
Besides I know everyone out there is just dyin' to play classic Nintendo titles on the Virtual Console (games are only about $5 to download)
Besides, a surge in sales over a 1 day period is hardly worth getting your knickers in a knot. It just means that some people were savy enough to wait, save $100 or so dollars, and still pay $500 for the most expensive game console in the world.
Post back in a month and we'll see if the PS3's sales are still way up there or if they bottomed out (again)
Edit: the reason they are probably dropping the price is so that when the 80Gb version of the PS3 comes out in August they can sell it for $700