In this week's release we added a bunch of fun new widgets. My personal favorites are the tag cloud and the sticky post widgets. I've added these to my blog if you want to check them out.
I think sticky posts would be great for adding a "mini about" to your sidebar. If you use the "more..." tool in the middle of your post or page, it will stop the content on the side bar at that point, so you basically get a little teaser of the article and then a link to go directly to the rest of the page.
You could also use sticky posts to list your personal records, or upcoming races.