Are these numbers just the game partition? The update partition adds (or removes) about 100 MB from these.
In any case Sakura Wars: So Long My Love is another huge one.@PaperLink64
For a funny twist of fate, The Last Story PAL was dangerously close to being single layer...its game partition is 4.87 GB.@Mirr0rR3flection
SMAS has got good company with Wii Chess @MrGameBoy
IIRC Okami and Dead Space Extraction are pretty much right on the bubble. Though I might have ripped those one with the update partition intact.