http://www.colorkeys.com/shopYou will find a free download of an excellent book and audio on using color keys to teach piano. I was looking around for a more affordable option to Soft Mozart. I just refuse to spend that kind of money for a short term period or a long term period. I just can't justify it for my current income. However, the free downloadable book from ColorKeys is an excellent quality and easy to read. It isn't very toddler friendly, but I can work with anything that is good material and concept overall.
They are working on getting funding to have an opensource software program to teach piano. They do not have software available for the home yet, but it is currently being used in schools in Canada. I know it isn't Soft Mozart, but hey, it might be a nice place to start. My motto...something is better than nothing. Thought I would share.