http://www.rapidsketch.com/
I have been using ClickForms for my appraisal software. I originally purchased Clickforms because it was suggested by another appraiser I know and work with. While the actual software works just fine, I have found the company to be lacking in their support and helpfulness after the initial purchase. Others I have talked with have had the same problems, while other appraisers think they are just great. I guess it's a personal preference.
Anyways, the sketching program that came with the software expired after a short trial period and Clickforms wanted a rather large amount of my money to continue using it. I found something far better!
Rapidsketch (see the link above) is a great program and the cost is less than many others. They let you try it out for 90 days free. A full version for 90 days free!
I have been using it for a while and it works great! It's easy to use and I no longer dread having to do the sketch portion of the appraisal.
And their Tech Support and willingness to help is second to none. This company is awesome!
If you are looking for a really good sketching program, I suggest you try RapidSketch.