Visual Boy Advance

The visualboy advance is a one of a kind gameboy advance emulator. It sports wonderful graphics, cheat code support and according to the site:
VBA is the best and most popular Gameboy Advance emulator around. Emulates GBA, GBC, SGB, GBA roms! Supports ZIP-ed roms, so that after downloading files from the net you don't even have to un-zip them.

You can download the visualboy advance via this link:
http://vba.ngemu.com/downloads.shtml