Is DJ Max Fever, hopefully dropping in early January. Finally this series is coming to the states, and having never imported Portable 1 and 2 everything in Fever will be fresh for me. This has always seemed like a perfect game for the PSP - beautiful, challenging, and frustrating but ultimately fun even if you only spend a few minutes with it. Love the soundtrack for the previous two games from all the YouTube videos floating around out there as well, though it may not be for everyoe.
I've only spent time with the demo for DJ Max Portable 2, but it's given me good few hours out of a few minutes of gameplay. Moving up from failing Sunset Riders in 30 seconds to finishing the demo regularly at decent speed may not be a lot, but it does give off the impression that getting good at this game will be worth the time spent in the end. Especially with songs like
this and
this to look forward to.

colors!