Not very often, I went in Nov with my brother to see the new Saw film that was out, then in Dec to see The Chipmunks, and I've not been since.
I wanted to go and see How To Train Your Dragon last weekend, but when I went to book the tickets online it was £34 for me and the 2 boys.

Then they always want popcorn and some pop, which is another £10.
The next time I go will probably be when Eclipse is released.