UPDATE: Their site about this is gone. Must have gotten depressed over all of the good answers they got.
"The Geocentrism Challenge"
"CAI will write a check for $1,000 to the first person who can prove that the earth revolves around the sun."
"Obviously, we at CAI don't think anyone CAN prove it, and thus we can offer such a generous reward. In fact, we may up the ante in the near future."
Link to the original article