Oh man, might have to grab PictoBits. My wife already has it on her DSi, where I played most of it, but would love to have on my own system, if only for the music. So worth it if you haven't played it before.
For now I'm still really enjoying last month's DSiWare offering, Spin Six. Lots of hidden puzzle gems on that store. BTW: Did you know that eye crust is made of hardened proteins?