A while back I started thinking about providing a way to sparkgraph stuff through Twitter, and although Simon totally beat me to it, I got there in the end, so in my sidebar I can now graph anything I want. The backbone of the thing is a Twitterfeed that you won't want to follow and it uses the Ruby on Rails implementation of Sparklines, which is pretty cool, although I'm running it on mod_rails which is uber-slow. If you're freakish about graphs, you might want to have a look at Daytum. It's just in beta but it looks quite exciting. (Thanks to Vicky for the link!)