Another connection to the wind...
A bit of background information, a more earthly one, not a symbolic one - but interesting nonetheless:
Triggered by a post by Adam in the Social Events Forum, I visited the findingbrokeback site once more and there found a link to a site called peakfinder.com.
The mountain we see in the postcard Ennis has at his closet door, next to The Shirts, is Mount Lougheed.
What connects this fact with the wind topic is the following: Mount Lougheed formerly was named 'Wind Mountain' and today the peak south of Mount Lougheed is named Wind Mountain and the steep peak to the right is called Windtower. And it's located in the Wind River Valley (Alberta).
So the mountain(s) who represent Brokeback Mountain in the postcard are closely connected to the wind.
How fitting.
(BTW more Wind names: Riverton lies in the Wind River Mountains Country (WY) and in the Winde River Indian Reservation, named after the Wind River that runs through it.)
If you want to read the whole story about Wind Mountain/ Mount Lougheed and Windtower, it's here:
http://www.peakfinder.com/showpeakbyid.asp?MtnId=558And here:
http://www.rmbooks.com//Peakfinder/peakfinder.asp?PeakName=Windtower