First of all, there needs to be an option to choose 2.7 as the version of WordPress you're using. It's weird that you can't choose it.
Alright, on to the real reason for this post: is there a widget for WordPress.org that duplicates the functionality of the "Authors" widget that you can use in WordPress.com?
I find it really weird that it's so difficult to find the default widgets used by WordPress.com. It seems like that would be a no-brainer.