• There are three suggestions here: Good Questions: Floor Plan Software?
• Check out Jack's creative floor plan here: #12: Jack's Think Big
• We liked helloat's suggestion in a comment on Good Questions: Can I have It All in an Open Floor Plan? -- "It'd be great if you could actually even sketch out a basic floor plan of the room (even a cameraphone picture of doodle on a napkin would be fine!)"
• We found Smart Draw via Google
• And Floorplanner, also via Google
• Being the techno-dorks we are, we'd use graph paper, a pen, and a digital camera
Other suggestions, anyone?
Image: Ape 301 - Floorplanner