Definitely a pretty good summer for movies, depending on your interests. I'm personally looking most forward to X-Men: The Last Stand and Superman Returns, but also movies like Pirates of the Caribbean 2. There are a few comedies that might not be too bad either, we'll see. Its a tough call to say which will do better, the X-Men or Supes. There might be a lot of pent up demand for Superman after such a long time, but the X-Men does have a strong following now. I personally like both, but I'm sometimes curious if Superman has lost some of the mass appeal among people (aside from kiddos). My wife and I are both big fans, but many of my friends (who aren't necessarily big comic people anyways) don't have a very high opinion of Superman. I don't know if that represents the general movie going public or not.
Next year should be a real nice year for movies, the way it is shaping up now. Among the movies scheduled for next year: Spider-Man 3, Fantastic Four 2, Pirates of the Caribbean 3, Harry Potter 5, The Simpsons movie, Transformers, Teenage Mutant Ninja Turtles, Shrek 3, etc. Not saying they will all be great, but there is a lot of stuff coming out.