I was actually writing this for my site just yesterday. I'm still hashing out some of the functionality but as of now it can collect a name, email, send it to aweber (I'm going to make it service-agnostic so I can pop in different providers), register a vB user based off the name field, and display a custom thank you message (all of these are different per list) -- all from a very compact and effective squeeze page. Maybe when it's done, I'll let it out into the open.