hi
a must have !! :
COOLNESS (excellent nes emulator)
http://hem.passagen.se/flubba/coolness.html
DARKNESS (another nes emulator)
http://darkness.freehosting.net/
ANES (idem)
http://www.anes.se/
Mysnes (old snes emulator)
[Link deleted, contains Kickstart ROMs etc - Graham]
Wzonka lad (game boy emulator)
and many more here/:
http://aminet.net/search?query=emulator