In hearing A.Ron and Jim discussing 3:10 to Yuma and how few westerns they've seen, I started thinking about which classic westerns would be good to recommend for people not all that familiar with the genre. There's still loads of westerns I've never seen, but here are some that come to mind:
The Searchers (1956) (Widely considered to be the best western of all time, but it is quite controversial in some circles.)
High Noon (1952) (One of the first revisionist westerns, about a marshal having to face a killer he had already brought to justice, while the town kind of abandons him. It's interesting, too because it basically unfolds in real time.)
Stagecoach (1939) (I haven't actually seen this one, but Orson Welles supposedly watched it over 40 times when making Citizen Kane)
McCabe and Mrs. Miller (1971) (Another revisionist western that always makes the lists, but I also know a lot of people find it a bit dull. I like it, particularly the ending.
Little Big Man (1970) (An early Dustin Hoffman film. It's got quite a mix of stuff, including comedy.)
Blazing Saddles (1974) (I'm sure everyone knows this one. I know it's a comedy, but it's a great parody of the genre.)
The Man Who Shot Liberty Valance (1962) (I don't remember much about this one, but I know it's well regarded and I remember enjoying it when I saw it.)
Rio Bravo (1959) (Entertaining John Wayne film. This one is referenced in Get Shorty)
Shane (1953) (I'm not a huge fan of this one, mostly due to the boy's acting, but it's hugely influential.)
Seven Samurai (1956) (A bit of a cheat as it's technically not a western, but it was remade as The Magnificent Seven. It's all circular though as Akira Kurosawa was heavily inspired by John Ford westerns.)
Yojimbo (1961) (Also a cheat, but it was remade as A Fist Full of Dollars)
Once Upon a Time in the West (1968) (Henry Fonda was a fantastic villain.)
The Outlaw Josey Wales (1976) (Clint Eastwood directed a few westerns before he made Unforgiven, but I think this is the only one of those that I've seen.)
What are some others people would recommend? I left off the Man With No Name Trilogy as it was mentioned in the cast as well as all the modern westerns they mentioned.