TweetMiner is a content discovery system for Twitter. It helps you find new Twitter followers and helps you discover content by keyword, workflow and other ways.

FeedBlitz automates turning publisher blogs and feeds into customized marketing communications using our integrated RSS feed management, Email marketing and Social Media services.

The DM-Tweet job is setup to easily allow multiple people to tweet to the account. The job takes direct messages from approved users and tweets those messages to the twitter account. The auto-follow job does exactly what you think it would, it follows those users who follow you. We feel this should be a core feature of twitter, but until it is, you can use this. The Feed-Tweet job allows a user to take an RSS feed and use it as a source of tweets for the twitter account. When the job checks your feed, it will create a tweet for each post in your RSS feed.

Proxifeed creates and broadcasts automated postings into your Twitter feed. Use keywords that match your areas of interest and let Proxifeed identify relevant real-time web content. Mix-in other RSS sources too. See your feed become exciting and engaging. More and more people will notice and start following you.

Twt.sy is a URL shortener that lets you "feed" your blog to it (via RSS) and tracks links to it with analytics.

The easiest way to publish your content to twitter, directly from your RSS feeds.

ViewPoint is a web based social media service that helps you follow your friends effectively by reducing the clutter. With an innovative reading interface that helps you scan through large number of posts effortlessly. Retrieving information from services including: Twitter, FriendFeed and RSS, your updates are grouped by similar items and our filters allow you to control your updates. By figuring out who is more important to you, we take the hassle out of organizing your groups and give you more control over who you follow. Instead of having to cram all your groups into one screen you can...More details

TwitterLit is a site that serves up literary teasers twice daily. At 9:00 AM and 9:00PM Eastern Time I post the first line of a book, without the author's name or book title, but with a link to Amazon so readers can see what book the line is from. Why? Because it's fun! The posts are also available for subscription via RSS, Twitter, Identi.ca, and email.

TwitterFeed is a web service that lets you push RSS feeds to Twitter for easy promotion of blog posts, etc.