I noticed wordpress.com doesn't have a widget so readers can "share" your blog on facebook / twitter / digg etc.
I wanted to have a share button at the end of each of my posts, to see if by sharing it, readers would improve my traffic. after a bit of searching around I found this article about how to do it:
it works really well, and is quite simple...basically, you cut and paste some html at the end of each of your posts.
I know nothing about html, but managed to tweak it so it only displayed facebook, digg and delicious buttons, which are all I'm interested in.
enjoy, and come check out my blog! I started it last week, and have averaged 170 hits the last two days due to a funny article I wrote about the BBC...