It's called 'FPV' (first person view), and google searches for "RC FPV" and "FPV flying" should be fruitful.

http://www.rcgroups.com/forums/index.php has an FPV section (and the rest of the RC stuff is obviously still relevant).

I'd also suggest a couple YouTube channels. Both FliteTest and RCModelReviews have numerous videos covering various aspects of the RC and FPV hobby.