BlastFollow enables you to follow Twitter users who share your interests en masse. This is accomplished by searching for users who have tweeted with a particular hashtag recently. For example, if you are interested in ISTE 2010 conference, you may want to search for users whose tweets have included the hashtag "#ISTE10". This would be useful if you are using Twitter in your classroom for students to follow a particular class thread.
TweetGrid is a powerful Twitter Search Dashboard that allows you to search for up to 9 different topics, events, converstations, hashtags, phrases, people, groups, etc in real-time. As new tweets are created, they are automatically updated in the grid. No need to refresh the page!
Somewhat similar to Tweetdeck
1. Real-Time Communication and Engagement
2. Collaborating, Networking, and Researching with #Hashtags
3. The Twitter Backchannel
4. Checks for Understanding
5. Projects