I have a 3 year old and a 6 year old. They really like the Curious George movie as well as Disney ones like Princess and the Frog. If your kids are just 2 and 3 with shorter attention spans, our girls always like Dora, Diego, Dragon Tales, Little Einsteins, and the Leap Frog shows like "Letter Factory".
This isn't exactly what you're asking, but I have a four year old and have tried taking her to a movie in the theater twice now. Both times we had to leave because the volume was so loud it hurt her ears. So I don't recommend going to the theater with a toddler who's too little.
We have watched a few movies. None of them have engaged her 100% from start to finish, but we enjoyed Finding Nemo the most. Several other 'kids' movies were too scary for her to sit through.