Doppler is a podcast aggregator
BSEditor: 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. And it does this in a very Smooth unattended manner. It?s Simple! Really.

For more information about what podcasting is, check out this page at wikipedia.org
you can free download Doppler 2.0.0.3 now.