Track student work or comments submitted to blogs or wikis: a clickable interface with a class list that would go to the comment or post.
You would be able to connect a class list with a new assignment that was on a blog or wiki. You should be able to see at a glance who had submitted work and who had not and be able to click on the student name to see the work.
Jolyon Terwilliger commented
Edmodo.com provides a service like this