Serious question, worth bothering with? The PSP has been a graveyard of disappointment for a while lately so I haven't bothered to follow recent releases.

PSP has been in comeback mode since the 3000 came out and started selling gangbusters in Japan. Lots of software for it. Almost getting to DS levels.
LBP, Motorstorm, Tekken 6, Gundam v. Gundam Next, Persona 3P (JP), Ys 7 (JP), Persona, Tales of Vs., Half Minute Hero, Assassin's Creed, Prinny, Phantasy Star Portable 2, GTA CWs.
Very soon Darius Burst, Valkyria Chronicles 2, Metal Gear Peace Walker, Kingdom Hearts 3, Classic Dungeon, Zettai Dungeon
Sure none of that might appeal to you if you hate jappafag games (Motorstorm, GTA, LBP, and AC are the only western titles). But then the portable space is almost entirely owned by Japan and animu, so yeah. Them the rules.