Rough specs / summary so far:

- 9.7" display
- .5" thick, 1.5 pounds
- Apple internal 1GHz CPU, ARM architecture
- 16-64GB of FLASH
- 802.11n + Bluetooth + optional 3G

- 10 hour battery ("months" of standby)

- runs all iPhone apps out of the box

- iBooks, lets you buy books from five major publishing houses at start, looks a whole lot like the App Store

- port of iWork (Keynote, Pages, Numbers)
- you could ostensibly use the iPad instead of a laptop to drive a Keynote presentation (presumably there's a VGA dongle for the port on the bottom, but they haven't said anything about it yet)