I built a parallel port sampler many years ago - was based on a ZN448 ADC if I remember correctly, and basically wired directly to the parallel port... Happy days!
I'm starting to find some spare time so I'll have to think of a new project soon, but my most recent one is my MP3 jukebox. The hardware's mostly finished, the only bit I have left to do is the PIC-based IR remote receiver. The software still needs some work too, but that's ongoing. The remote part in itself could be useful as a stand-alone device for any Amiga, I guess that could be my project 
If you wanna see the player, have a look here:
http://www.robthenerd.com/show.php?sect=projects&sub=jukebox&page=photos
Well done on the mod, it looks great!
