Lumines, not Luminous.
Anyways, buy Hot Shots Golf: Open Tee. There, much better.
Ridge Racers is worth checking out.
I'm sure you could look into GTA: Liberty City stories. That was well-received by a lot of people.
But honestly, honest-to-god, I haven't touched it since October! And ever since I picked up Mario Kart/Animal Crossing, I've realized I've wasted money on the PSP.
If you own a DS just get Animal Crossing (must-have) or Mario Kart.