The open office.org version will work fine if you don't want to shell out $$ for MS Office with Powerpoint.
2 years ago I started teaching myself Powerpoint and found it very easy to learn. I currently have my boxoffice times displayed on a 19" monitor that displays showtimes, pics of the movies, and trailers I download off Apples site in Quicktime and convert to avi.
My concession menu is displayed on a 32" plasma screen with animations of various items along with items and prices.
The boxoffice display takes me about 5-10 minutes a week to update. A bit longer if I'm adding some new stuff.
I'm currently working on creating an interactive kiosk display for people interested in viewing movie trailers or get production info. on one of the current or coming soon attractions. Going to incorporate sponsor advertising into this one.
Currently not doing pre-show displays as an outside vendor handles that but have created some sample shows just to experiment.
What I enjoy about it is the freedom to create a unique display and the ability to change something on the fly if needed. Plus the displays really catch peoples eyes and I've seen an increase in pc at the stand since changing over.
[This message has been edited by reelman (edited April 03, 2006).]