At today’s Real-Time CrunchUp, Mozzler launched its real-time search engine based on Twitter. Mozzler, which has real-time functionality, searches Twitter for the most popular content in the last six hours based on retweets.

You can search Mozzler by keyword, similar to searches you can do on OneRiot and other search engines that include Twitter results. Results can include videos and images as well. Mozzler has also created numerous categories of searches under technology, entertainment, sports, business and more.

What differentiates Mozzler is the ability filter the stream. You’ll be able to create customized streams by keyword, which are updated in real-time. You can share links to streams on social networks and users can also subscribe to streams.

And one particularly compelling feature is Track (which should be sure to make TechCrunchIT editor Steve Gillmor happy), which is like Google Alerts for Twitter. Twitter has yet to implement Track yet, but it’s a very desirable feature to help filter and “keep track” of the stream.