Its a bit of an obvious one, surprised noone has done anything yet.. the closest I can find is My Portal (US of course) and TVTonic (only really has trailers, US again, of course).
You could configure the plugin for internet connection, location (for your preferred cinema).
The main page could have a brief listing of movies that are on (a small thumbnail picture, cast and classification). Select a movie from the list to go to more detail, which could have the usual data; director, cast, movie review rating, duration, genre plus a full review (and user reviews maybe). Add a small window to show the trailer for the film, and a table at the bottom of the page for full session times..
Damn, it sounds so good

I wana write one now..