From ReadWriteWeb. Slightly dated, but still very useful list of tools to archive your twitter history. Someone, please build a usable Twitter archive app. :-)
10 Ways to Archive Your Tweets
By Sarah Perez / August 11, 2009 6:48 AM
What that means is something tweeted prior to a week and a half ago can never be retrieved via search.twitter.com. That’s bad for users and it’s definitely bad for data-mining. Unless Twitter corrects this issue on its own, we have to find another solution for archiving tweets ourselves. Here are 10 ways to do so.