I am about to attempt to design a chess set for the blind in 10 days as an experiment in showing a “live” product design process. I have to fit it in around so-called real design work, so it might be a bit erratic, but if you wish you can try and follow my progress here: http://duncanmckean.com/2012/03/product-design-process-how-to-design-a-product-in-10-days/
Wish me luck.