Google's TalkBin allows your customers to send you digital text messages through their mobile phones while in your store. This tool is meant to help engage people in your store and allow them to send you anonymous feedback, suggestions, and questions to you in real time and lets you respond immediately via your cell phone or via email.
When you sign up for TalkBin you receive a TalkBin phone number and TalkBin signage from Google. Customers in your store can then send anonymous text messages to your TalkBin number which is then forwarded to you. No personal information about the customer accompanies the message, encouraging honest communication from your customers.
Here are some TalkBin videos that will help you better understand TalkBin...
To learn more and sign up go to TalkBin.com
By the way, you can supposedly get the TalkBin service for a $1/month through the end of December. See http://blumenthals.com/blog/2011/12/13/googles-talkbin-special-1mo-per-location/ for details.