For ultimate inspiration, check out this blog and the possible savings: CarFree.us: Living Carfree in the Southeast United States since 2009
I can thank this book by Chris Balish for getting me started down this (bike) path.
Vanessa Farquharson made one environmentally-friendly change a day for a year. Some changes she made that I’m still following/trying: cancelling my cable, only watering my plants with greywater, keeping the light in the bathroom off each morning while showering.
Doug Fine upped and left civilization, moved to a New Mexican ranch, replaced his Subaru with a veggie oil-guzzling truck, and tried (and succeeded) to live off the grid.