13.2 GB for me. Thanks Kevin, Thanks GoodThings2Life. Went ahead and deleted on a hunch that most of that space was taken up with files of old video podcasts that have been viewed.

Looks like that’s what’s happening, as after a sync, I now have only 111 MB of Zune temporary converted files. Not removing the converted files of aged video podcasts is a bug, the storage equivalent of a memory leak (but with a different workaround: Disk Cleanup as opposed to Shutdown for memory leaks).

It should be noted that deleting these “temporary” files will cause the Zune software to reconvert any previously converted media on future syncs with the device. Larger media files may take significant time to sync in the future if these are deleted.