The Labs team is at it again with their newest addition Project Draw. This is a free web based sketcher that allows you to create simple floor plans, electronic-circuit diagrams, network diagrams, user interface mock-ups, and more. I didnt think I would have much use for this until I spend about 10 minutes with Project Draw. I quickly realized my paint program will have a little less use in the future. It is very easy to use and for certain applications will make creating sketches and drawings very simple. You never know, I might even get my wife to retire Microsoft Paint and start using an Autodesk product!
Take a look at it on Labs.