If you got the recent Nintendo Power which is OCT 2003, then you'll notice that Sonic AdventurE DX: Directors Cut placed 2nd place as the top selling game for the Gamecube :) Zelda: Wind Waker was in first.
Also, for the top selling Gameboy Advance games. Sonic Advance 2 placed 10th for the 3rd month in the top ten "top selling games" for the Gameboy Advance.
Source: Nintendo of America