does any1 know where i can get a development kit for the psp? and if so, how does a person sell a game on the psn?

email sony, go to any developers near you, or ask gameloft, thatgamecompany....ect they're independent maybe you can learn stuff from them.
or ask Egoraptor, hes on newground he made one "Mini" game.

what language is the psp written in?

you have to be with a company and the game will be submited to sony, if they want it they will put it on PSN, if not you waisted about $10,000 on a PSP dev kit

Buy an iPhone dev kit for 100 dollar... make a game.. sell it on itunes.. hope it becomes a succes.. tell sony you want to sell your succesful game as a PSP mini.. get approved to buy a devkit from Sony... port your iPhone game for quick cash.. make your PSP game...

I want a free promocode for the iPhone version!

didnt they say that ps3 and psp dev kit prices went down something like 90%?

you don't have to be in a company to work on Minis though, they're made for community based games.