Originally Posted by
simbun
Do you have, or could you add a single tag to all your files to differentiate them? At that point you could add that tag as an Index/Container to Asset (or as a Library Exclusion if you're not interested in serving podcasts) and make that your first browsing selection which would exclude all the files from the other categories for subsequent browsing.
EDIT: If not a single tag, I know you have COLLECTION=1 that could identify your collections, but is there a tag that's always used for podcasts but nothing else?