Final Fantasy 3 is one to look out for, and Final Fantasy 6 for the GBA came out, which is all I play now. Castlevania and Warioware were also pretty fun.
Final Fantasy 3 <-- super addicting Megaman ZX the Castlevania games Trauma Center: Life in the ER <-- do surgery! and johny you need to get the SD card cartridge and passkey so you can make some homebrew games with lowpoly goodness! see the other thread