NetNewsWire has built-in support for Netflix queuing! When an interesting movie pops up in an RSS feed, I simply:
1. hit the Right Arrow to open it in the built-in web browser
2. hit Command-Shift-Left Arrow to switches to the newly created tab (Command-Shift-Right Arrow would work if there was only a single tab opened).
3. click the Add button
The next time NetNewsWire downloads my feeds, the new DVDs show up in my queue.