unknown podcasts category created by itunes 7 not accessible for deletion

I have been using Audio Hijack Pro to record "podcasts" and add them to itunes. After upgrading to itunes 7, these podcasts have been put in :podcasts:unknown podcast: where they can be found by smart playlists, but they do not appear anywhere in the library, so I cannot delete them through itunes.

Any way to access them in the library, or do I have to wait for 7.0.1?

Malcolm