Has anyone found a good one? I've tried a bunch... they either don't do podcasts or correctly handle SHA1's on the iPod Classic.

 I'm using iTunes on Windows...which takes 100% CPU. I'd really like to find an Ubuntu-native alternative that's efficient.

 Edit: Video support would be nice, but not a show-stopper.

 ITunes lets you export your subscriptions as OPML, which makes it easier to recreate those podcast subscriptions.