In years past, I would rearrange rooms monthly. I'd dump the contents of every dresser/bookcase/box on the floor and move all the furniture several times till something clicked. Or broke. Well, until I broke, anyway. And then I would spend a couple hours sifting through all of my stuff, tossing the bits and pieces I didn't want anymore and re-stashing everything I couldn't live without.
Today I'm using bhg.com's Arrange-a-Room. It's much easier.