I want New Super Mario World, done by Miyamoto and with some actual secrets. NSMB lacked those... Also it's level selection screen had no soul. All in all, the DS already got more Mario love than the GBA ever did, though.
Heh, I said New Super Mario World too!
Mario Party Advance BLEW CHUNKS! Shouldn't even be considered a Mario Party game. I thought it'd have freaking link cable mulitplayer... but nooooo... They really do need to make a Mario Party for the DS and WiFi would kick ass. Other than that, there's nothing too much of Mario that I'd want on the DS now aside from a NSMB2
(or a NSMW?! ) and a Mario Golf title.