For all you marrieds out there, here's a tip... eleven tips, actually. Tip number one should sound familiar by now: change your light bulbs to CFLs. (Just be wary of deals involving Girl Scouts and Scientologists.)
10 more basic green tips follow—it's a good link to forward to a friend who's just waking up to this whole green thing.
The Nest is a site with tools and advice for modern newlyweds.