Santa was kind enough to bring my daughter Karaoke Revolution, and we've been having a ball with it. But, the microphone looks like it belongs to a 70's cassette recorder. (It's the same style as the Mario Party mics, just black.)
I saw that Konami made a pretty nice looking mic for the PS2, but after Googling the crap out of it I couldn't come up with anything else for the Gamecube.
They'll probably be back with more VC games next week; I think they're just going to cut back on weeks when they're bringing out WiiWare games. VC Japan (Tuesday, May 13) - Bubble Bobble (Famicom, 500 points)