I was hoping to find what I need in this thread:
http://www.digitpress.com/forum/viewtopic.php?t=63291
There's some good info in there but it's been edited over several weeks and things changed fast.
I can find the emulators themselves easily enough, but what does a PSP owner need to do to get started? I'm looking forward to playing TurboGrafx and Genesis on my PSP!