Im not sure if its possible to do this or not, but it would be nice to be able to use the arrow keys and numpad to navigate the links on the site. especial when viewing galleries being able to hit right arrow to goto the next page would be great

Sure this has been done already for e.g. Orkut:
http://userscripts.org/scripts/show/28189

Deviantart solution left as homework for someone with more time than I have.

well thats a start