This site does not support Roms and Emulators therefore you won't find any here. However, by following the links below you can get to the best Rom sites on the web.
PE2000
Probably one of the best site for the roms on the web. It has over 2000 roms for almost every system
This site is also good for Roms. The layout could be better though but if it's Roms you are after then you'll be in luck.
This site is not in "Best Rom Sites" list, this is IS the best Roms site on the web. Everything works, everything as it should be. No N64 roms though....
There isn't many good Rom sites out there since most of them are full of dead links and annoying pop-ups. The ones mentioned here are probably the best on the web, they are full of roms and crazy shit doesn't pop-up every second.