Looking for a site that lists bike tours from a host of tour operators (i.e. VBT, Backroads) in the US and abroad. Anyone, anyone? Preferred tour operators?
If you search the ACA website, Adventure Cycling Association: http://www.adventurecycling.org/, Im sure you can find something. Not only do they have tours you can take part in but they are one of the biggest windows for the touring world someone can find in the united states. If they cant personally help you they know who can.
I can personally recommend America By Bicycle www.abbike.com for supported motel based touring. I've done their Mississippi River ride from Minneapolis to New Orleans and their East Cost ride (NH to FL). The now run the Mississippi River ride in the other direction from S to N.
Check the links page at the United Bicycle Institute website: bikeschool.com. There's an entire section of links for tour operators. I think there might also be some links on Sheldon Brown's site. Good luck and be safe.