iPodderX Lite for Mac

From Thunderstone Media:

With iPodderX, you can easily subscribe to RSS newsfeeds with enclosures, also known as podcasts, and any files in those enclosures are automatically downloaded to your Mac. Photos are shuffled off to iPhoto while music and audio is moved into iTunes where it can be synced with your iPod -- it's like internet radio to go!

iPodderX is the most advanced podcast client for the Mac and features an integrated Podcast Directory for easy finding of new and exciting podcasts, Keyword filtering so your feeds bring in only the files you're looking for, and much, much more!

iPodderX Lite is free, but has a limited feature set of the full version.