Did you try closing and reopening the browser after you switched Fit Width To View off? YES

Can you get ANY websites to load normally? NO
(I even tried using my 3G wireless Softbank as a modem via bluetooth and the same thing.) Funny thing is before I went to work I could load SOME sites, now I can't load anything. so it7s getting worse. Could it be a cache problem?

Are you running any applications in the background while you're using the browser?
NO

Did you update the firmware and reformat the internal 2GB memory card before using the N810? NO

Regarding a reset, IMHO the best way to do that is to reinstall the firmware. If you've already downloaded the firmware the reinstallation shouldn't take too long.

I'm going to run the battery down to 0, recharge and update the firmware tomorrow. But formatting the internal memory will wipe of some stuff (maps and so on) that are in the memory.