Last week we told you about "lean startups" and how one of their strengths is rapidly collecting customer feedback and implementing changes to their product. With online tools like Get Satisfaction, gathering the opinons of your users is easy, and now with InstantLoop you can even hear what they have to say with automated phone surveys. InstantLoop is the recent winner of the Twilio Startup Weekend Challenge, a contest for companies utilizing Twilio's API for sending and receiving phone calls.