billingsgazette: Billings Gazette (my hometown)
montana_news: from Topix.net; includes other MT newspapers
wyoming_news: Casper Star-Review
Flickr photo feeds:
flickr_montana: photos tagged "montana"
flickr_glacier: "glacier park"
flickr_ylostone: "yellowstone park"
Another feed of general interest to anyone in the Rocky Mountain West is newwestnetwork: New West Network.