Added to Podcasting Software list: PodcastBlaster is a free online service for generating podcast feeds.

To use, you fill out web form fields that are used to generate the RSS file. Each time you creates a new episode of your podcast you can come back to your Podcastblaster account and add a link to that new MP3/MP4 file. The site generates a new RSS file to replace your previous one.

An account at the site is required.