One that I watch repeated times, especially in the dead of winter,
is "Cast Away" with Tom Hanks.
In reading up on the background of the movie, I found out that
the screenwriter for the film William Broyles, Jr., spent a week studying
survival skills on a desert island in the Sea of Cortez with instructors from the
Boulder Outdoor Survival School. So when Tom Hanks does the survival stuff in
the film, it's actually authentic.

The other one that I've heard a lot about, but haven't had the opportunity to see
yet, is "The Snow Walker".

Snow Walker is set in northern Canada in 1953, and is about a bush pilot and an
Inuit woman stranded after a bush plane crash.
I'm hoping to get that one soon to be able to watch it, but after it starts to
warm up here and the snow we have melts away <img src="/ubbthreads/images/graemlins/grin.gif" alt="" />