Some time ago, I ran into GPL issues with the iRiver PMP-1xx series. For some reason, the Korean company chose to cease distributing their products in Germany, rather than making them GPL compliant.
Despite that, they've now sent me a CD-R with the source code. I've made it available to interested parties at ftp.gpl-devices.org. I did not yet have the time to do a full-scale analysis whether it is complete (as per gpl definition of "complete corresponding source code"). However, at least from a first quick look it seems fine (and even documented!).