Timpa....Google and reading are your friends. No portable console has region locked games (excluding DSiWare)...
And unlike home consoles, there is no chance that you'll run into screen resolution issues (like with SDTV resolutions and NTSC/PAL games).
Region lockout IS an option for UMD games, but to date, no devs/publishers have used it. UMD movies on the other hand, are indeed region locked.
