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We have seen our fair share of new Twitter search engines and memetrackers over the last few months, so in order to stand out, a new service definitely has to offer something special. DailyRT bills itself as a straightforward tweet aggregator, but in addition to tracking retweets in real-time, dailyRT also offers a number of advanced search functions that none of its competitors currently offer.

Tweetmeme, a memetracker that tracks popular retweets on Twitter, just launched a real-time version of its service that displays tweets that are currently in heavy rotation on the popular microblogging service. In order to filter this constant stream of messages, Tweetmeme users can choose to only see messages that have been retweeted at least twice, though the default setting is for five retweets and can go up to twenty.

For a service that simply takes 140 characters of input and then blasts them out in front of potentially hundreds of thousands of readers at a time, there has been a lot of work by people and businesses to figure out the best way to re-interpret and re-group Twitter posts in to meaningful categories, trends and threads.

Two common ways that have developed are link tracking and meme tracking. In the first case, it's fairly simple - just take all the URLs posted on Twitter, uncompress them if necessary, add up the uniques, and sort them by popularity. But today we are going to focus on the latter case, services that look for a specific keyword, topic, or hashtag (all falling under the fuzzy category of meme or viral idea) and cluster related tweets together.

MicroPlaza provides you with a personalized memetracker based on the links that your friends share on Twitter. While we have seen a fair number of Twitter memetrackers, none of them feature the degree of personalization that MicroPlaza offers. If you follow a very diverse set of people on Twitter, you can also track micro-communities thanks to MicroPlaza's 'Tribes' feature, which lets you organize users into different groups. MicroPlaza is currently in private beta testing, but you can get a glimpse of its non-personalized features on its home page.