For homebrew: http://risa22.co.cc/dxe/?page_id=12
Chat with our AI personalities
.nds and you can download roms in that format.....
NDS Homebrew Hive.
Games-engine or hkorz
You need to download an emulator that supports wifi
Download custom theme creator(live search), and use the tutorial here: http://psp.about.com/b/2008/06/24/psp-theme-tutorial.htm im happy to help!