FeedBlitz!

FeedBurner is a web feed management provider launched in 2004. FeedBurner provides custom RSS feeds and management tools to bloggers, podcasters, and other web-based content publishers. Feedburner can also replace services like "TwitterFeed" and feed Twitter your URL. More info here: http://www.labnol.org/internet/send-feedburner-feed-to-twitter/11694/

FeedPress handles the RSS Feed of your website, blog or Podcast and offers advanced statistics about your feed's subscribers as well as the ability to offer Newsletter subscriptions. You can automatically publish your new entries on your social networks accounts like Twitter, Facebook, App.net. & easily migrate from FeedBurner without losing subscribers.

Feedity is a web-based service that enables users to easily create an RSS feed from any website for consumption on any platform.

Feedio is a powerful web-based service for bloggers.

Create RSS feeds and display RSS feeds on your website with FREE and simple online RSS service. Also Publish podcasting feeds, Track RSS feeds, Import Existing RSS feeds and much much more!

FEEDCAT.NET is mainly dedicated to boosting feeds and also serves as a public catalogue of feeds (RSS and ATOM). You can submit your feeds and use services for free!