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The Archivist By Mix Online

http://archivist.visitmix.com/ The Archivist is a service that uses the Twitter Search API to find and archive tweets. The Archivist does not have access to the Twitter "firehose" (ie., all the tweets ever on a subject) . As such, the tweets archived by The Archivist are not guaranteed to represent a complete historical record of a given term or search. Read the FAQ to learn more about The Archivist. Visualizations are graphic representations of the data your archives. Visualizations generated by The Archivist may not represent a complete historical record.
http://leslieposton.hubpages.com/hub/twitapps

Useful Twitter Applications

Twitter is everywhere. It's impossible to escape the ubiquitous 140 character microblog. Sure, some people have tried to move to Jaiku or Pownce, begging me to do the same, but until those two applications get as much functionality off their own site as Twitter has, I'm sticking with my Tweets.
http://visitmix.com/work/archivist-desktop/

The Archivist Desktop By Mix Online

The Archivist is a Windows application that helps you archive tweets for later data-mining and analysis. Start a search with The Archivist and get as many results as it can. The, leave The Archivist running and it will poll Twitter for that search.
Use Tweet Nest to easily store, browse and search amongst your tweets to find exactly what you're looking for, and let others do the same. New-style retweets, geographic places and links to original tweets included. Backup Additionally, Tweet Nest serves as a backup of your precious tweets on your own server. Tweets that might grow too old to be retrieved from Twitter.com will not fade out here, allowing you to go back in time as much as possible. Media http://pongsocket.com/tweetnest/

Tweet Nest