Multiple Monitors for display

Hello,
My boss has come to me with an interesting question. He wants to set up a display outside a church. He has been looking at the big screens that are beside the highway and outside sports arenas, you know, the giant LCD (i think they’re liquid crystal) screens that flash ads and what not? Anyway, these are pretty pricey and he was wondering if there is a way to rig a PC and bunch of monitors together to acheive this effect. I know the PC will have to have multiple interfaces with lots of resources, but we can figure the logistics out later, I only need some ideas. Thanks Everybody!!

Chris