I have added a rotating set of 5 text links on the footer of every (non-supporter) blog on the network. This is to add a bit of revenue to the site which is consuming bandwidth like Britney Spears in a cake shop during fire drill!
As an extra, I’ve added a new widget that you can use to transform the links that point to the advertising page into affiliate links for YOU. Just follow the instructions on the widget to add your own affiliate id (you need to register using the link shown in the widget options first).
More details in the tutorials/make money section.