Napster? I thought Napster was almost dead. There are programs out there already that can remove copy protection from wma files. Due to forum rules I can't mention such, but one was mentioned on the forums within the past week. I think it was in the Lounge.

As for auto converting. I'm sure it could be done. On the mac it can be done a few ways. Most popular is applescript. As iTunes automatically imports files (but doesn't re-convert them) directly after LimeWire has downlded them. Windows of course is a little different.