Sketchup
I've been fooling around with Google Sketchup in recent months. It's a great tool for helping clients to better understand and visualize the project. I've been using it to draw cabinets, model entire floorplans, plan a bathroom renovation, and more. It can be used in the shop to model each component in a cabinet or piece of furniture. Timber framers use it to plan every timber complete with mortices and tenons. This can really speed up layout and production.
Google offers it in a Pro version ($495) and a free version. For most people, the free version is perfectly fine. It's an incredibly powerful piece of software.

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Mark Landry is the President of Landmark Services, Inc, one of the premier old house renovation contracting firms in Massachusetts. He loves old houses and would welcome the opportunity to discuss your renovation, restoration, or addition.