1. Go to
www.pspupdates.com for much info on the PSP...
2. A .PBP file is a type of program file (such as Homebrew etc.). The PBP File is the file that is launched to run a program. In most cases the PBP is the whole programm itself. (Think about it just like an .EXE file)
3. You need emulators written for the PSP. Go get them at
www.PSPUPDATES.com / There are many tutorials that will tell you how to run an emulator... (but its really damn easy!)
4. There is a program out that makes a "dump" of your UMD Disk.
5. There is a way to play Lumines (without sound). More to come... Have to check the news tho... Its just days till a real "launcher" for the UMD Backups will come out!
For any other questions just ask!

(Oh jeah... and again: Excuse my bad english)