Last few weeks, all TV show in my watchlist are downloaded automatically. Just need two application to do that. Transmission, still best torrent client for Mac I think, but I’m not trying µTorrent beta for Mac yet. Second, Automatic (preference pane plugin actually), allows you to auto download content linked in RSS feeds: podcasts, videocasts, torrentcasts.
How to set it up? Quick Start Guide & Tips available in zip files you get Automatic’s site. It’s pretty clear, screenshot available. Get the feed link, make new subscription, insert filter. In Transmission, you only need to set ‘Watch for torrent files in’ (Preferences > Transfer). Code On a Diet, both lightweight and easy on the resources.
Oot. Midseason, many new show. Best new show: The Pacific, story about World War II, created by the same team behind Band of Brothers.
[update] You can also use Hazel to auto extract, auto move files, rename files, etc.