ReFilter, a simple RSS filter - written in PHP. Also uses Cache_Lite for caching, Snoopy (actually, Kellan's modified Snoopy-with-gzip) to get files, PHP-Markdown to keep the HTML manageable, with a bit of CSS and some XSL

My Newspaper - a personal RSS Aggregator and Reader written in Python with a bit of javascript and uses sqlite as permanent storage for the articles

The Podcast RSS Buddy - produces RSS feeds that are iTunes-compliant. Simply enter your Podcast’s information at the prompts, press the button, and the RSS Buddy creates the XML file for you. You can up-date your feeds within seconds, letting you focus on producing your Podcast, not struggling with your RSS feed. The Podcast RSS Buddy is fully iTunes-compliant, and lets you manage up to 4 different Podcasts. Windows and Mac

JTA is an international news service that provides up-to-the-minute reports, analysis pieces and features on events and issues of concern to the Jewish people. RSS feed now available

DesktopBargains is a free RSS feed which anyone can subscribe to. However, instead of being informed of breaking news stories like most RSS services, subscribers are fed up-to-the-minute special offers for a wide range of products and from a comprehensive selection of suppliers, directly to their desktop. Only products that are less than half normal price are included in the feed, and by clicking on the "More Info" button you can buy the product straight away