Going green, how do we start?

Getting more environmentally friendly has been on my mind for a long time now. Just this morning, I read about Discovery Channel buying a pro green blog site, and that reminded me: going green isn't just about keeping the earth sustainable, it's also good business these days.

However, while my inclination is to "go green & get eco friendly" I must confess that we're not entirely sure what we should do to start.

If you have any ideas, let us know by commenting or posting some questions on the site proper. Thanks!