Check out this outdoor theater! You could fit the whole neighborhood in your backyard! Amazing that you can have the neighborhood over to watch movies in the yard! You can even swim in the gorgeous pool beneath the screen while More - Luxury Homes
Backyard theater projector setup Tutorial via Instructables - I like how this exemplifies how compact you can be with your setup. A laptop for video, the projector, and it looks like speakers in the bottom. complete with power strip!