I have a G1 and have purchased Doggcatcher. I subscribed to this feed from Practical eCommerce: http://www.practicalecommerce.com/podcasts.rss
When I try to download any of the poscasts, I get a "Failed" message. I can play these podcasts on my Windows machine fine.
This does not happen with other feeds.
Try setting the feed option - "Make filenames unique". It look like that feed has identical filenames for all the media.
No, that wasn't the problem. I'm an idiot, or a newbie to G1, one or the other. The problem was that the SD was mounted as a drive to my computer. So you can't download while the SD is mounted. Once I unmounted, downloading worked fine. Sorry for the post!