screen protectors are a waist imo. plus they look horrible. get a good case and everything is great.
best case i've seen (the one i use) is the logitech playgear pocket.
http://www.logitech.com/index.cfm/pr...ONTENTID=10181
very sturdy, strong, protects the whole PSP, and has access to shoulder buttons, wifi switch, power switch, headphone plug, and power plug While the case is closed.
flip the lid and the psp is easily playable while in the case (i actually find i like it better that way, gives you more to grip onto)
then the flip lid can flip all the way back and become a stand for the psp, so like i do, on a plane, flip it back, set it on the tray and watch a tv show.
it only holds the psp, however i have like a bag (carrying case) that i can put that into and all the games, headphones and things into while psp is still in that case. dont have to worry about anything then.