PSP Flash SDK
If you missed it, since firmware 2.70, the sony PSP includes a Flash Player. Along with that Adobe opened a developer page dedicated to the PSP. The embedded player is a Flash Player 6. The only huge drawback is that the playback of video data such as H.263, Sorenson Video or Motion JPEG is not supported 
maybe next time ! By the way, if you want to do some real development on the PSP, hook yourself up on ps2dev.
