Tweet Scan is a unique way to search and remain updated on keywords as they are mentioned on Twitter.
The main benefits of the service include being able to find lost or multi-user replies, scan up to ten phrases for daily or weekly delivery, no ads or spam, and the ability to turn updates off at any time. Several key online services (including Twitter) are being indexed and utilized by the service.
On the front page of the site, you can find a simple search box and a search cloud of the most popular current terms. There is also the ability to download a portable webpage and CSV file with your message archive including replies (their database goes back to December 2007).