Google’s announced their philanthropic arm:

Google.org includes the work of the Google Foundation, some of Google’s own projects using Google talent, technology and other resources, as well as partnerships and contributions to for-profit and non-profit entities. While we continue to define the goals, priorities and approach for Google.org, we will focus on several areas including global poverty, energy and the environment.

Google.org.

(via Boing Boing, who say that the founder of the WELL is involved).