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I've been spending some time understanding how to program in the programming language Lua. There is some soure code on PSPDev from skippy which provides a shell for people to program games for the PSP. Instead of needing to compile the entre PSP toolchain, all you need to do is edit a text file. Modify the script, drop it on to your PSP and you've got a game.
It's something like this that sony should pick up sign with their key and put on a UMD with a nice graphics library. Then they give the ability to allow people to create their own games allowing homebrew to thrive without feeding into the piracy of their commercial games.
I'm looking forward to the PC player and the next release of Lua with GU lib. I have not ran into any major bugs, but it was difficult to understand some of the syntax. It helps to learn by example, and so far there are only 2 games out for this. I will be releasing the source code for my game when it's ready.
One thing that would speed up the development process is the ability for Lua to activate the USB on the PSP so you can modify the script while still in the game, then just hook the start button to restart the script when it's finished loading.