Is there anything else that works on Games n Music other the CD and the ones on the..

website?

Yes. a lot of games will work with it. Make sure you know how to DLDI patch. If you don't know how then ask around the forum.

I can vouch for what jakor says.
I'm running oodles of S/NES ROMs and a buttload of homebrew on my GnM.
While quite a large number of homebrew works w/ the dldi patch, those that don't (if they're still being worked on) have it in the pipeline.
Almost everything here I am running or have run.
Stuff I'm finding on various homebrew forums is also on my GnM card and working fine.

I think it's time for me to invest in a larger capacity card, too :D

I want a good one, like R4 but I can't buy online. Stupid credit card laws. -_-

couldn't you save up money, than use some one elses creadit card and pay them back?