Twistory – Twitter History
http://twistory.net/

Add your Twitter backlog feed to your favorite calendar application and browse through your personal Twitter diary, making your Twitter history both fun and useful! Features include: a) Works with all public Twitter accounts; b) Real time updates; c) Timetracking tagging: start your tweets with both t or /t and Twistory will keep track of what you’re doing; and d) Going back (almost) all the way to your very first tweet. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog.