The GC would make it pretty flax, though. Think about it - your arcade machine would start up to a GameCube logo, followed by a Game Boy player logo, and then the whole time there'd be this dumb border around the screen. Furthermore, the video won't be particularly sharp with the bi-linear filtering the GBP uses.
The rest of you, shame on you! Is googling so hard?
This'll get it running on a nice VGA CRT monitor; much better than an old composite TV.http://www.rival-corp.com/2010/12/02/ga ... adapter-2/http://www.youtube.com/watch?feature=pl ... 7LzetRlZEg
(not practical for this, but awesome)