Doppler is a podcast aggregator. It’s a tool to subscribe to RSS feeds which supply downloadable files. Doppler will go out and fetch the files enclosed in the RSS feed and will automatically add them to your preferred media player.
The current source code is a rewrite (and currently not very structured) of Doppler 3 CTP. Much clean-up and restructuring is needed. Please reply in the discussion if you want to join the development team.
More information about Doppler can be found at http://www.dopplerradio.net