Short Circuit. Also, the Ring (the 2002 English remake of Ringu) was decent. I don't know where it was filmed, but I heard it was in Oregon. The characters and dialogue were terrible, but the pacing, atmosphere, music, effects, etc were really cool.
http://www.imdb.com/title/tt0064782/locations Filming locations for Paint Your Wagon (1969) Baker, Oregon, USA Big Bear Lake, California, USA Big Bear Valley, San Bernardino National Forest, California, USA (Holcolm Valley, exterior) Paramount Studios - 5555 Melrose Avenue, Hollywood, Los Angeles, California, USA (interiors)
Some other movies filimed in Oregon: *Mr. Holland's Opus (Portland0 *The Hunted (Portland) *Stand By Me (Aurora)
Haven't seen this but it sounds like a landmark film filmed partly in Oregon: http://www.imdb.com/title/tt0020691/
Speaking of movies in Oregon, Phil Knight is building 'Laika animation studios' in Tualatin. http://www.laika.com/
Music Within http://www.imdb.com/title/tt0422783/ It's not as big as the major name out there, but its a great movie. Into The Wild http://www.imdb.com/title/tt0758758/ Some of it was filmed in Oregon but there were all over the usa. Bandits http://www.imdb.com/title/tt0219965/ Its alright, not a favorite