I love using vinegar to clean with. It is cheap (I can get a gallon at Save a Lot for under a buck), natural and multipurpose (hey, you can clean with it, disinfect with it, and eat it)
The three things I use vinegar for most often are:
#1 Fabric softener. I just put it in the liquid fabric softener dispenser in my washing machine. Although there may be a slight “vinegar” smell when you take the laundry out, it disappears when the clothing dries.
#2 Mopping the floors. I use a squirt of dishsoap and a few “glugs” of vinegar in my mop water.
#3 Deoderizing. A small dish of vinegar left in the microwave, fridge, or on a counter naturally absorbs odor.
There are tons of frugal folks who have written at great legnth about the wonders of vinegar. Some of the best are the Vinegar Page over at Frugal Living at About.com and the Many Uses for Vinegar Pages on Frugal for Life.