The obvious thing for me to add here is this:

Summary: I'm running an online advertising company specializing in Google AdWords account management. Find us leads; for every lead that signs up as a client, we'll donate 25% of the first month's management fee to the Singularity Institute or a charity of your choice, and give you (or SI, or another charity of your choice) 25% as a commission. For clients of the size we work with, the first month's management fee starts at around $2000 - meaning that a successful referral should earn you and your charity at least $500 each.