LOL. Why the hell would Nintendo do this. I think they love us because it's actually true.
DKC3 from 4097 KB to 3076 KB
14 games from 26,2 MB to 17,0 MB
EDIT: Even the stock roms can be gzipped. From 48,5 MB to 30,7 MB
38 games + OS and only 35% used