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.
Already own it, got the GigaBowser trophy, which means I'm the SSMB Undisputed CHAMPION! But back on topic, excellent review, Nastio. I happened to play SA2: Battle at a friends house, and it was pretty entertaining.