It's not often I see an implementation using AJAX that I appreciate (not since google maps probably) but this is really nice.
I was just booking my tickets to Casino Royale at my local cinema and they've recently revamped their webpage and I love it. I realise that most cinema companies have a similar AJAX based system but there's something about this design that I feel works particularly well. Especially the left to right layout so that the dropdowns don't obscure the next steps.
Go and have a play on the cineworld.co.uk
My only complaints are that it could be quicker, and the dropdowns could be larger to reduce scrolling.