My biggest task has been in reducing my electricity usage, I have been able to get my monthly Kwh from an average of 800 down to mid-300's every month. This has been done by making sure all air-leaks had been sealed, adjusting my thermostat on my furnace, every lightbulb is a CFL, I even got rid of some light fixtures that weren't 100% needed. All my electronics are on surge protecters which get turned off every night, when I leave home, and when I will be away from the room for more then a few minutes.
I compost almost everything, from paper to dryer lint and hair. this keeps most everything from the landfill.
I grow a lot of my own vegetables, what I don't have I buy locally from organic growers.
I no longer commute to work, by working from home I have saved 60 miles per week round trip.
When I painted my house last I only used natural paint, so there was almost no Voc's
I recycle everything I can, unfortunatly my community doesn't accept a wide variety.
These are the biggest ways I try to reduce my footprint, if you want anything else please let me know