Broadband..
I'm actually using a type of DSL connection; it's called Etherloop, made by Elastic Networks. It's pretty wicked at what it can do. ADSL modems hog up whatever spectrum they want; it won't shift around to find a spot with less interference. An Etherloop setup has a entire host of spectrum that it analyzes and finds the best throughput to S/N ratio. If a DSL modem comes online and interferes with the Etherloop, it will move to a different spectrum that it has analyzed in the past. It's pretty funky to watch the server-end of the process where a person can actually monitor the spectrum shifts. Etherloop isn't being widely used, mainly because it is quite expensive to implement and there are security risks involved. The connection acts just like a WAN; I can print/fileshare to systems on the cooperation's network that is miles away.
The last time I checked, the connection was rolling along at 6000/4000kbps.