Just saw Poseidon at the London IMAX cinema at Waterloo, London. It won't win any oscars but a pretty enjoyable as a 90 minute blast. Some of the scripting is incredibly, ridiculously bad that it's difficult to imagine it being any worse, the acting is pretty lowly (bad even for Kurt Russell!) but the big wave bit and plenty of tension, not to mention giving most of the audience an everlasting fear of cruise ships, rescued it, just. The one thing I have to say though *this was my first visit to an IMAX cinema and it was superb. That's definitely the way to see a movie. Massive screen, amazing sound, plenty of space to sit. Can't wait to see IMAX Superman Returns in 3D!