On a day when data was released surrounding the Palm Pre's launch and Apple announced the iPhone 3GS, the clear loser was the Palm Pre and its carrier.

Palm: -6.5% Sprint: -2.9% Apple: -0.6% (rebounded from -3% after WWDC) AT&T: -0.3%

You will notice in the below chart that the market's reaction occurred before Apple's keynote (which was relatively expected materials) and actually rebounded as the day progressed... suggesting that the movement was rather a reaction to the Pre's weekend sales: