Haven't read it yet, but Ernest Cline did write another book after RPO. It's called Armada. Sounds a bit like a modern take on The Last Starfighter to me.
"The story follows a teenager who plays an online video game about defending against an alien invasion, only to find out that the game is a simulator to prepare him and people around the world for defending against an actual alien invasion."
Nice. I'll check it out.
Does sound like The Last Star Fighter though.