I have to commend Sony for openly embracing import gamers. The PSP and the PlayStation 3 are region free for games, but not for movies. The latter is understandable considering movie studios are stuck with draconian product control that has a thankfully easy work around in the form of a region free DVD player. UMDs are a different story because they are region encoded and there isn’t a simple fix if you are using official PSP firmware.
However, the new MTV releases indicate a change of pace. All of them have an “all” region label instead of a number indicating the region next to them. Perhaps, this is only for MTV UMDs or this is some kind of packing oversight. I hope neither of these are the case and Sony plans to make the video format completely region free, especially if anime studios start selling entire series as cheap as the UMD Aeon Flux collection.