1.) Don't know linux well enough to answer part 1, but its an ARM processor, as far as I know there's no version of OpenOffice compiled for that. Abiword and Gnumeric do work though
2.) You should be fine with that, those some programs might slow up a little.
3.) 512x384 episodes of Family Guy that I have work great as is, haven't tried anything else yet.
4.) Handles AJAX pretty well in MicroB. However, it's not tab-based but window based. I've personally never had more than 4 or 5 windows open so I can't say.
5.) Not possible that I know of.
6.) You can put the device in offline mode, ie turn off the bluetooth and WLAN.
7.) Not sure if it'll work if they all have the same SSID, but I'd imagine you'd get disconnected at every switchoff.
8.) No idea
9.) Yes it sees the SD cards, and yes SDHC does work.
10.) Not sure what bashpodder is, but I doubt there's an ARM version.

Edit: To clarify 3, I should mention that I'm on OS2008, so its running at 400mhz instead of 300, and also that this is on a version of mplayer that I found on these forums.