The website toplessrobot.com just recently listed their top 10 greatest time travel movies HERE.
My favorite time travel movie is Déjà Vu with Denzel Washington. I also really like Frequency a lot. Even though there’s no actual time travel, there is communication across time and changing history happening.
Also I saw Timecrimes last night and although it's not my favorite, it does introduce some very interesting themes and I would recommend it to everyone (warning: it does show boobs).
What’s your favorite time travel movie?