Aaron pointed me at a twitter site that displays all your tweets in a really nice way: twilog, I liked it so much I decided to do some work on a Greasemonkey script to change twitter.com to look like that. Version 0.01 is available on this page: Twitter Greasemonkey info verion 0.01.
After Aaron pointed me towards twilog.org, I got interested in changing the way twitter looks to me, but without going via a third-party site and the API. The answer of course is Greasemonkey!