If you or someone you know works for a non-profit organization, check out the Google Grants program:
Designed for 501(c)(3) non-profit organizations, Google Grants is a unique in-kind advertising program. It harnesses the power of our flagship advertising product, Google AdWords, to non-profits seeking to inform and engage their constituents online. Google Grants has awarded AdWords advertising to hundreds of non-profit groups whose missions range from animal welfare to literacy, from supporting homeless children to promoting HIV education.