Well, after a few problems (including being convinced for almost a day that I'd bricked my Z), I have successfully flashed the Opie image. There are a ton of little things that annoy me but there is one major improvement that just makes it 1000% worthwhile:
The Medium Mount control panel allows me to tell Opie to scan only specific subdirectories for media files. It means that when I insert my CF card loaded with complete HTML references for Python, Qt and DOM, I don't have to wait close to three minutes before I can proceed with my work. Another benefit is that my Documents tab is no longer cluttered with hundreds of files I don't care about.
This makes a huge difference for me and makes my Zaurus orders of magnitude more useable. The UI for this feature is not very elegant, of course, but I still feel absolutely extatic about it. Thanks guys!
z.
P.S. Sorry if anyone has written about it already, I'm just really excited