DickyDick1969 has released v0.81 of the PiMPStreamer. He mentions that he added a new “rendersize” option which can also be of use for all you PSP Users. PiMPStreamer is extended into a fully HTTP-browsable wireless FLV video streamer, tested on a PS3 and a Wii. On the PS3 browser it worked nicely - although the author is asking for a video size option in a future build, since the PS3 can support higher resolutions than the Wii.
Basic instructions: install to PC, run PiMPStreamer, configure Opera (or the PS3 browser) to the PC’s IP address at port 3333 (configurable), and proceed. Stream movies/mp3s to your PSP, WITHOUT rescaling muxing etc.. Use at own risk. No warranty or whatever.