I've recently started downloading a bunch of torrents, which contain every GBA game ever released in every territory, In all, that's about 2500 roms. Total size: 11.something gigs.
Now, of course I don't need all of them, but it's very tough finding specific GBA roms from rom sites, so torrents are really the only sensible way to go.
I don't know what this thread is about actually. I am just real happy waiting for all those games to come down. I just recently found out how much fun playing GBA games on my laptop can be. Image quality is stunning compared to GBA/GBA SP. Easily as good as the DS, and you can enlarge the screen size as much as you want (though you lose image quality in direct proportion to the size of the screen). Also, it's pretty cool that I can keep all my saves in my hard drive. Emulators rock sometimes.