This website is helpful for comparing upscale residential communities. While only in Florida currently, it is my understanding that they will be adding luxury gated communities in other States shortly. What I like most is the ability to connect directly to the right agent, the one specializing in the community.
Luxury Gated Communities is an online resource for many of the finest private residential communities. The website provides useful real estate related information and the ability to request more information from a real estate professional specializing in the luxury gated community.