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!