Seriously, I used to buy Gamecube games a little bit back before I bought a US PS2, but my collection never really got all that huge. Now that I have a decent PC and Dolphin has gotten fairly mature, I've been buying more and more Gamecube games. Hell, even games I already have on other platforms just because I want to be able to run them in stupidly high resolutions on my PC.
Ripping takes a while per disc, but I love being able to do the whole process on my own without having to rely on downloading copies from the net. Kind of reminds me of when I first got my Super Wildcard DX2 and I dumped all of my SNES games + save data. That was fun.
I just bought the Spider-Man trilogy (Spider-Man / Spider-Man 2 / Ultimate Spider-Man), though the Dolphin wiki is showing them as not exactly perfect (quite far from it, it seems). That's ok, I can wait.
Recently I played through Hulk: Ultimate Destruction via Dolphin and while it wasn't entirely flawless, it was DAMN GOOD. Really makes me want to break out and play Prototype on PS3 so I can see where Radical went from there. Heard good things about that game...picked it up cheap, never got around to playing it.
Ty the Tasmanian Tiger (which probably doesn't work very well judging by how Ty 2 runs), R: Racing Evolution, and Spartan: Total War should be here within the week, too. Spartan was awesome last I recall when I played it on Xbox, and with as amazing as Burnout 2 looks, I can't wait to see how R: RE turns out.