I don't know many people who come to the Vegas Strip to watch a movie but this is a good place to beat the heat, kill some time, and maybe take the kiddies if they've run out of family friendly things to do on the Strip.
The UA Showcase Cinemas are located right around the corner from Coke World and tickets are available for purchase at a kiosk next to M&M World. The theater isn't anything special but it has A/C on full blast and the seats are somewhat comfy with plenty of leg room.
This theater also offers $7.50 matinees which for me turned out to be a convenient 3 PM matinee. Score! I don't know any other place in the country that offers first run movies that cheap. I spent my last day in Vegas watching Oceans 13 (the perfect Vegas movie to end a Vegas trip). It was entertaining and yes Brad is still munching in this film.