Eudora 5.1.1 installed and worked fine, without any of the problems I've read about online.
Installed Palm Desktop 4 (which advised me that I menght need to restart). Tried to sync, no luck. Software Update in Classice said it needed to download something for the Palm USB/Serial Adapter widget, but couldn't find it. It was then I noticed that AirPort had gone from four bars down to two. Rebooted and all was well. Kinda of strange, but I'm used to these sorts of things.
Now all I need to find is a decent, Fetch-like FTP tool and the OS X version of Analog and I'll be updated. Oh, and Mozilla 1.0 (when it comes out).