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.
Rock Band Network DLC (Thurday or thereabouts) – Big Kenny – One More Time (80 MSP) – Dance Gavin Dance – Lemon Meringue Tie (160 MSP) – Gang of Four – A Fruit Fly in the Beehive (160 MSP) – Morgawr – Herlathing (80 MSP)