In Four Steps to the Epiphany, Steve Blank covers (pp. 59-60) strategies for making first customer contacts, the process for engaging early potential customers about your idea. I have been sending a lot of introductory Customer Development emails lately and helping several start-ups craft them. Some lessons learned.
This is a good post that discusses how to contact potential customers in order to solicit input about what you are making. In lean customer development, this is a very important aspect of the whole process, as more feedback will result in better definition of what is working and what isn’t.