If you are using Twitter regularly you might find the Twitter real time search script handy. Tweet Scan makes it possible to search in real time for keywords on Twitter. The result of the search is displayed on a individual page that can be bookmarked or subscribed in your favorite RSS reader. If you would for instance want to stay updated on anything related to Yahoo you could search for Yahoo and add the RSS feed to your reader.
Results are displayed with user icons and and a preview of the message that has been published at Twitter. Searches can also be filtered by username. If you want to search all messages at Twitter from a specific user you can do so by leaving the keyword field blank and only entering the username in the second form.
Tweet Scan can be added as a search engine to the list of possible search engines if you use Firefox. I have not tried it with other browsers but it will probably work as well.
It seems that registered users can also receive updates per email. I did not want to register to the website and could not check that out though.
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Try itpints! it’s a real time web search page: http://itpints.com