Prayer is a weird thing. If you try to turn prayer into a way of asking God to do things, before long you’ll find yourself in a morass of conflicting theological precepts (e.g., God does whatever God wants versus God answers prayer). So a lot of Christians I have spoken with define prayer as little more than "communication with God." Apparently just initiating the link at all is enough to make prayer worthwhile. But doesn’t God know all my thoughts already? Oh, but God likes when you share voluntarily. Okay, sure, whatever.
Theomorph has posted some interesting ruminations about prayer. Anybody care to respond?