I love this plugin, can I make a feature request? Add another widget for listing blogs in the network - with similar options like the current widgets have, like exclude some blogs; there are other plugins that can do this but they don't allow you to exclude blogs.
So I would do it like this:
list the blogs in order that they were last updated, and show the number of posts in brackets after the name of the blog, and as I mentioned allow to manually exclude some.
Just an idea...