Goomba Color is a GBC emulator written for the GBA. Even though the GBA usually natively plays GBC games, Goomba Color provides the convenience to run multiple games from a flash cartridge, and also runs on the Nintendo DS and Game Boy Micro.
Additionally, check out the Goomba Color Board on the Pocketheaven forums.
The current version is 3-31-2008.
Version 3-31-2008: Download, Source Code (for programmers), GCC Source Code
You can post comments at the release threads: on Dwedit's Board, and at PocketHeaven
I recommend you post on My Message Board or the Pocketheaven forums. You can also email me of PM me, but I recommend you post on a message board first.
Version 3-29-2008: Download, Source Code (for programmers), GCC Source Code is pending
Version 3-18-2008: Download, Source Code (for programmers), GCC Source Code is pending
Version 1-29-2008: Download, Source Code (for programmers), GCC Source Code is pending
Version 1-26-2008: Download, Source Code (for programmers), GCC Source Code is pending
Version 1-16-2008: Download, Source Code (for programmers), GCC Source Code
Version 1-13-2008: Download, Source Code (for programmers), GCC Source Code