Care2 was mentioned in a fantastic article from Hollis Thomases at ClickZ! Hollis's post explains why green advertising, or "greenvertising," is becoming increasingly important for companies who are trying to reach a mainstream audience.
Sure enough, she lists Care2 as a great place for advertisers to reach a "truly qualified audience of influencers" - a "potent buy" as she calls it. We happen to agree with her. ;O) Thanks Hollis!