A few simple requests for developers who make Twitter clients:  

1. Please create a static archive of your users' tweetstream in a publicly accessible place. Have the URL be a function of their Twitter username.  

2. If you're going to use RSS as the archive format, please don't repeat the content of the tweet in both the title and description element of the item. That's the way Twitter did it, apparently status.net copied them. It's a bizarre choice, and requires guesswork to properly deal with on the other end. Pick one or the other. In my application I store the tweet text in the description element. It seems more like a description than a title, to me. Here's my linkstream in RSS. 

3. Allow users to subscribe to these feeds. This means your users can follow people who may not be on Twitter. It's a step toward our independence.