www.greenmomsmeet.com, is an excellent site! especially for bloggers, mom group leaders, etc.
they work kind of like www.houseparty.com, but everything is all natural, organic and so on.
they will send email invites to members, and you have to fill out a very short survey, for different products, ecover, method, stoneyfield farms, earths best, seventh generation, etc.
they have a great set up, and also offer coupons time and time again through their site. as well as webinars on a variety of topics.
kashi also has a great community. they send coupons and samples through the mail.
www.recyclebank.com is another super site! if your trash collectors do not work with them, you can still earn points thru surveys, watching videos, etc. they have a good variety of coupons to exchange you r points for!! recently, they had a coupon for a free bag of Wonderful pistachios;p