AL'S EMU PAGE
Click on the DOWNLOAD NOW button next to the emulator you desire and unzip.

NES
NESTICLE.zip - 473kb
GENESIS
GENECYST.zip - 424kb
SNES
Z-SNES.zip - 260kb
GAMEBOY
SMYGB.zip - 44.3kb
ARCADE
MAME 32.zip - 2.61mb

AL'S ART is not carrying any roms (the games to play on the emu's).
HOWEVER......These are links to the sites that I have found to be the most reliable and complete.

EMUX
http://www.emux.com/

EMUCLASSICS
http://www.emuclassics.com/main.php3

VIMM'S LAIR
http://vimm.net/