Problem: Mac bittorrent clients don't support RSS feeds, and I would like to download files from assorted bittorrent RSS feeds.
Solution: I created an Automator application to automatically download the latest files from the bittorrent RSS feeds I follow (this hint should work with any bittorrent RSS feed).
I used Safari to bookmark the RSS feed I was interested in following, though I use Google Reader for my other RSS feeds. If you use Safari to read all your RSS feeds, you need to specify which RSS feed to process in the workflow. I then created a workflow that opens Safari and Transmission, processes unread RSS feeds from Safari, downloads the torrents, and marks RSS articles as read.
The workflow is saved as an application which is then launched automatically at set times by iCal alarms. Transmission's watch folder is set to the same folder as Safari's downloads, so Transmission automatically detects the torrents and starts downloading away.
Details on the workflow:
Mac OS X Hints
http://hints.macworld.com/article.php?story=20090428080912741