IGN Cube has a "first look" at WarioWare for the Gamecube. Its not just a straight port, as Nintendo has opted add a multiplayer mode, which should only serve to make the game even more insane. Sounds to me like Nintendo may have made yet another classic four-player party game.
I was excited about the e-Reader add-on for the GBA when it first came out, because it had a ton of potential. It still does, but it's barely been used by Nintendo themselves (Clu Clu Land or Urban Champion are not what I'd call system-sellers)