Further to my post of yesterday about real life gay cowboys, you might be interested to read the Advocate magazine interview with Brokeback Mountain author E. Annie Proulx. She has some extremely complimentary things to say about the movie, even though she wasn't directly involved, and especially about the perfomances of the lead actors.
I've yet to read her collection of short stories Close Range: Wyoming Stories which includes the short story Brokeback Mountain. Years ago I read and loved her novel The Shipping News, although I found the movie a disappointment.
It sounds like I won't have that problem this time.