use cold water in the washing machine
cut down on the amt of laundry detergent. Usually half the amount that is recommended will work just as well for a normal load.
Don't let the hot water run when getting your shower ready
While getting the shower ready put a bucket in there to catch the water that is being wasted and use that for any number of things
Don't buy the throw away ready to use cleaning wipes (dusting, glass etc) just use old towels cut up and wash them.
Go to places like the various dollar stores in your area (we have hundreds of them around here) to buy various cleaning agents and well almost anything you can think of.
Use the library for books and music. (I highly recommend making sure you have a place to put the books which will keep them out of reach of little hands, sinks and also seperate from other books/music items so that they are not misplaced)(if damaged or lost you'll end up paying the cost of replacement)
Freecycle.com
this might sound stupid, but honestly, just be Nice to the people you Do have to use for professional help. It really can make a huge difference. If you choose to go the route of getting a better deal...
Go into it with a good base knowledge of the product and company you are dealing with. Makes a difference.
http://www.vinegartips.com/
Comments have been made about canning and freezing. Canning is a great way to do things. However, it can be costly to get started. While it is worth the investment, check your flea markets and garage sales for supplies.
A dishwasher, from what I've heard, actually does cut down on the amount of water used compared to washing dishes by hand. However, don't use the drying option. Let them dry naturally. A few spots never hurt anyone.
If your windows are older, get them replaced if possible. OR use plastic to cover them during the winter months especially.
http://www.stretcher.com/index.cfm