It would be very useful.
I don't know of any site that does that - i go to pistolforum.com, lightfighter, m4carbine for a good idea of what's out there. Some of the big names do private classes as well if you contact them directly. I know Greg Ellifritz does classes on his own and for TDI, Robert Vogel does classes, as does Steve Fisher. Mad Duck Training is another good source.
Really, it depends on what you're after - tactical disneyland, shooting skills, medical, mindset/psychology of aggressors, etc..
Never settle for the ordinary.
Rights cease to exist when restrictions are put on them.