I just finished watching Star Wars (the original) with my daughter. She was seeing it for the first time, and I hadn't sat through the entire thing in a long time. She loved it, and it was a lot of fun to watch it with her. Still a very fun movie. Most of it has held very well over time.
I saw "How to Train Your Dragon" in the theater the other day, and really enjoyed it. One of the better animated movies I've been to see with my kids.