The websites are all run with Joomla, it's really easy to use. That way all sites across the network have a similar "look" but you can make it however you want it. I am not sure on the bandwith but I guess it's alot, I can give you the webmasters msn or email and you can ask him all the technical questions. We have added more sites, we still need some ATP ones
If you have any questions just ask, we would love to have you