Not sure if this is what you are looking for, but I think Steven Raichlen is like the "king" of grilling. He has a blog - it's not the most attractive, but probably has lots of tips and recipes? www.barbecuebible.com/
In Chicago, there's a guy who's pretty known for his bbq techniques (but this is strictly bbq - not grilling) - there is a forum on his site: www.lowslowbbq.com/