The first thing I did was do away with ALL my cleaning supplies. Now, the strongest ingrediants I use to clean with are baking soda and vinegar - and I LOVE IT!! So much cheaper, and cleans just as good, if not better!!
I am also slowly changing out all my lightbulbs - as I can afford to - which I must admit I don't like very much...not quite bright enough for me at night really, but I guess it's just something I'll have to get used to. I find that I open the windows more often during the day for light too, so that saves electricity!!
I also try to arrange for all my errands to be done in one round-trip, rather than making several trips around town per day. Saves alot of gas, and time!!
I am also slowly cutting meats out of our diets, and trying to eat more veggies and fruits.
Wish I could say I've started a garden, but where I live right now I just don't have room outside. Guess that's no excuse, as some people have container gardens....
Let's see...I also try to not BUY so much! Especially things that are packaged in styrofoam, and I NEVER take home my fruits and veggies in plastic produce bags anymore. (Unless, of course, that's how they're packaged, like carrots or lettuce...) If I shopped for these items at farmer's markets though, I wouldn't have this problem at all!! Too bad the closest one to me is over 60 miles away...
One thing I REALLY need to stop doing is taking home the plastic grocery bags. I do reuse them for all my garbage now, but it's easy for them to accumulate, and I'm trying to reduce clutter. I'm really bad (or is it GOOD) about re-bagging my own groceries if I go to a check-out where the checker bags the groceries for you. I've found that sometimes they ignore me, though, even though I KNOW they heard me...and just put two or three items in one bag!! I don't have a problem taking things out and re-bagging them myself though, and I figure at the very least, maybe someone behind me will stop to think about using so many bags too - especially if I hold up the line for another few seconds.
I also wash everything in cold water too - even though I do my laundry at a laundry mat. Unless it's a rare load that I need to bleach with hot water, this is what I do now.
Oh, and I recycle aluminum...
There are more, but that's all I can think of right now...