Active forum on cat boats, the cat rig, and catboat get-togethers. Has a good search facility.
Site includes lots of connections into the world of New England catboats, including a list of builders. Useful information about the rig.
For the newbie, here are the characteristics of the typical catboat and its rig.
A mailing list on the subject of catboats and the cat rig, catbout designs, races and outings, and other related topics.