Have a N800 but not used anymore due to the screen constant rolling. So I got a N810 WiMAX, nice replacement. I use it for:

Internet Radio (while on the road I can keep up with home news) with the stereo speakers it allows me to listen while not having to carry it around with a headset while in my hotel room.

Log in to my vpn dd-wrt router (while on the road/hotels/airports) with openvpn where I can securely stream my music (flac) from Ampache, surf the net and make voip calls.

DialCentral... what can I say about it, a Swiss Knife of communication tool.

Boingo Mobile unlimited for $8.00 a month world wide makes caring my N810 on the road a no brainier, and Clearwire 4g is icing on the cake!

Hope Nokia comes out with a tablet the same screen size or larger (N900 is screen too small).