I've been doing PPC with Adwords for some time, and have been getting familiar with the semi-new feature offered by Adwords, Cost-Per-Phone (CPP). Essentially, Google gives you a phone number and you pay every time a potential customer gives it a call. Similar to PPC, CPP allows you to bid on phone calls with a minimum bid of $1.00. You can assume the prices are going to be much higher than PPC due to how targeted the customer is; and most clients should be OK with this.
Pretty new to my eyes, this system could bring a ton of new business to our offline customers who are already utilizing PPC advertising. Did you know about it? Have you used it?
AdWords Call Extensions: CPP Details Begin to Emerge - Chicago Style SEO
"I hear and I forget. I see and I remember. I do and I understand." -Confucius