My WFMW tip is about changing pads for your little ones. :-) My diaper bag came with a really nice changing pad. But its vinyl and takes up almost half of the diaper bag. So I took a set of curtains that I had made for the nursery but were way to short for the windows and threw one in the diaper bag. It takes up about as much space in the bag as a recieving blanket and can be thrown right in the washer with the rest of baby's clothes. Its the perfect changing pad and can double as a spit cloth (which I have done! LOL)
So there's my WFMW tip! Check out Rocks in my Dryer for more great tips and to add your own.