Have you heard of Rainmaker? (www.rainmakerecentral.com) It is the best I have found that has pre-written templates. There are a TON of letters and categories to choose from. I highly recommend it - it is a little pricey though, about $78 per month I think. Some of my clients use it, and they like the results that they get. If you can afford that much per month, it is worth every penny. I have a temporary user name and password you can use, but I can't post it on the board. Just shoot me an email if you want to know more. I dont sell Rainmaker or anything so dont be scared

I am a virtual assistant so I try to help realtors make decisions about what would help them best.
The other one that I am researching is
http://www.netrealcampaigns.com I dont know much about it, but I know that it is cheaper. I am not even sure if they have pre-written sources or not, but I am thinking so. If you want to sign up, they give you a 30 day free trial, so check it out.
Hope this helps
Thanks
Nancy