There's a nice video and some pictures of the Palm OS emulator running on a Nokia N800 here:
http://www.palminfocenter.com/news/8987/nokia-tablet-garnet-vm-video-demo/
My only question is why would you want to do this?
You can pretty much get emulators of vintage technology for everything (I have a NES emulator on my iPhone and a BBC Micro emulator on a PDA) but this is really for the geek factor. I've nothing against Palmsource but the the argument that suggests "wow, you can now get 38,000 Palm app's on a much more powerful computer than a Palm" strikes me as not especially useful.
I wonder what Nokia think of this?