Well i tried creating an ad-hoc connection sharing my internet connection one time to make my pc a wifi hot spot. the n900 connects but does not show any web pages, so i will have to look into that later.
doing it by usb is more complicated since usb networking is not easy to access on n900, and i haven't tried sharing a connection over usb on a pc before.

i'll think about posting it on the wiki. i need to make an account since i've never posted there before. but i prefer people visit my site haha