At that Flurry post this just showed up in the Comments:
However … if this is true, then it’s really more of a bombshell than the leaking of the resolution. Because of the Page Source at that site:
What? The iSlate/iPad will do Flash?! I am very skeptical of this.
Frankly, I think many people would be disappointed at a screen resolution of 800×600 on a ten-inch color screen. Wouldn’t that lower the dpi level from that of the iPhone/iPod Touch?