I was looking for just such a tool about 6 months ago. I managed to find the excellent podcast hosting solution Loudblog instead, so my quest terminated prematurely. However, for those of you that have a directory full of podcasts and no feed for your listeners or viewers to subscribe to, I bring you Escapepod.
This link is off the Coral CDN and is slower than heck, but it will eventually resolve into a page where you can grab the file.
I found this tool under Podcasting News' excellent publishing tools list.