Tweetmeme - this does what Techmeme does for the blogosphere, as a matter of fact it looks exactly like it. Techmeme tracks popular tweets in the tweetosphere, and clusters similar tweets. Tweets are considered popular if there are lots of tweets about the same thing, and how influential they are…perhaps using a similar influence method as Tweeterboard.
It only deals with tweets that have links, and it displays the meme so the link is the title, it’s also sectioned into different types of links…blogs, images, video and audio.
Some tweets may be popular with the same word appearing a lot in a small time eg. bushfires, but this won’t appear in Tweetmeme unless the tweet has a “link”…for this we will have to rely on word burst services like TwitStat, Twitterment and others. Not sure why Tweetmeme can’t have a word burst meme section, or even a topical word burst section like Politweets.
There is RSS for each section, an archive that is made every 5 mintes, a river of news view, and Tweetmeme will also notify you through a Twitter reply if you are the first person to post a link to Twitter that leads a popular thread on Tweetmeme.
Shouting Mat.ch - basically the same as Tweetmeme, only tweets is a channel in a bigger service, it’s also a blogosphere topic memetracker for lifehack, politics (competitor to Memeorandum), tech (competitor to TechMeme), gossip (competitor to WeSmirch), sports (competitor to Ballbug)
Twitter100 - Imagine you grabbed the RSS feed of 100 people you follow on Twitter and entered all the feeds into a startpage, so you had an enormous widget poster of the latest tweets from people you follow. Well you don’t have to go to the trouble, just head over to Twitter100, enter your username, and your done, plus you can click on a users name to see their Twitter100…check out the very similar Gridjit.
Hellotxt - similar to Brabblr, it’s a meta-posting page where you can post to one or multiple services at the same time. The main services covered are Jaiku, Twitter, Pownce, Facebook and Tumblr…now all we need is a desktop widget version.