Read through that.
PC Dreamcast emulator nullDC's author "drkIIRaziel" seems pretty interested in starting a DC emu for the PSP. Now, don't get excited and start digging up your Sonic Adventure disc from the closet yet, he's interested in it. Seems he'll start with PSP Slim though, as it has more ram.
Who knows? A PSPDreamcast could happen after all...
Check this post for videos: