The movie Frequency with Dennis Quaid is an excellent time travel movie. And it's not time travelling per say but time changing. The way the past is changed and how it's handled in the present is very interesting and can be applied to Lost. I'm sure everyone has already seen it, it's been out for years, but it's so good. Elizabeth Mitchell is in it, too. There's another time travel movie called Prime. It's awesome. Not a big studio picture, but the ideas put forth in it (evil twin) are also very interesting. Anyone else have any other time travel/changing movies they can suggest?