I'm enjoying iTunes' podcast features, for now. Not downloading anything automatically (that's what M3Ucast was for, but I found I wasn't listening to enough of the downloaded tracks to make it worthwhile), just using Playr's RSS bookmarklet on some MP3 blogs, subscribing in iTunes, then picking out tracks to listen to that look interesting (can we have some proper music licensing now please?). Playing podcasted videos in iTunes is nice too.
Update: Playr is now producing .pcast files for easy podcast subscription. It seems that iTunes' handling of these files is still a bit buggy though - they only work occasionally.
Update: Forget the .pcast files, it's easier to just use pcast:// links.