More pictures of the Galaxy Tab have 'leaked'. These ones are interesting, as the proportions of the icons/widgets in relation to the display seem to suggest a higher res than the 800x480 phone beside it.

http://www.engadget.com/2010/08/29/s...-teasing-cdma/

I think 7" would be utter perfection for a tablet. Small enough to be very portable (albeit not pocketable -- less of a concern for me), but large enough to be comfortable for casual use. Just like Rebski said, I would intuit that there would be a HUGE difference in usability with the additional 3" over a smartphone.