Punisher: No Mercy and Other Games Reach the PlayStation Store
Capcom Classics Collection Remixed can be downloaded to the PSP for $20 and includes 20 classic Capcom arcade games.
Mind Quiz can be downloaded for $10 and is a brain-training-style game for the PSP.
Tom Clancy's Splinter Cell Essentials can be downloaded to the PSP for $20. While the game is similar to that released as a UMD, the UMD and downloadable versions can't play with one another in multiplayer mode.