n900 - smaller screen (I preferred the larger one)
n900 - great camera
n900 - better faster browser for reading (hard to go back)
n900 - opens pdfs faster
n900 - usb charging - and don't have to worry about charging 2 devices (cell and table)
n900 - awesome integration of chat and skype
n900 - videos play a bit faster (some larger .avi files my n800 would choke)
n900 - Meego ready