For my early testing, I used a MAC OS X application called Omnigraffle. This application is very similar to Microsoft Visio which could be used to create very similar images.
I was able to take an old line drawing of my home, import a scanned image and set the image to 50% transparency. This allowed me to use the above applications to quickly replicate the floor plan with straight lines and other graphical elements.
I have attached the result of under 40 minutes of work in the application.
While I have not finalize the details yet, I am working with a company to allow eKeypad to provide a floor plan creation service. Hopefully everything will be finalized next week.