I just got a PSP and I'm a bit lost when it comes to the different ISOs and CSOs out there. A CSO is, of course, smaller than an ISO. Beyond that, I see nothing but chaos. I've seen different sized ISOs and different sized CSOs for the same game. The difference can be as much as 200MB, which just confuses me. What's going on and why are there different sized ISOs for the same game? (And I'm not saying that the ISO is different from the CSO; I'm talking about different ISOs for the same game.) Also, is there a release list like we have for DS roms? Something cohesive to make sense out of all these different files. At this point, I'd be happy for any kind of guide for PSP ISO/CSO releases.