a pretty cool site for video game wallpapers:

http://desktopgaming.com/index.php

Awesome gifs and sprites form sonic and mario:

http://www.dan-dare.org/SonicMario/SonicMario.htm

Also in case i really ever need to play some old school games, a good emualtor site:
http://www.emulator-zone.com/doc.php/n64/project64.html