When he says they built 6 hi-fi mockups of their product to go sell --- is he implying that they build mockups for 6 different products, and had the prospects select which one they wanted?

I'm a little stuck on the Discovery vs. Validation distinctions in Blank's book; in my head, "Discovery" is about "do your customers have this problem", and "Validation" is about "ok, can we get 20 companies to buy this almost sight-unseen"?

(This is very, very, very relevant to me at the moment).

Good to know that this is relevant to you, hope you get some tips/help out of it.

Excerpts: What are the most common mistakes that startups are making today?

... As much you say, get out of the building and call people. I challenge a startup that says, they are a Lean startup to tell me who is the last customer or person you called and did a customer and problem interview with. They don’t do it; they sit behind their computers and look at the codes and metrics. They sit their and survey people; they prompt people on their website for feedback. But, they don’t call; they don’t get on the phone; they don’t do it...

Thanks for highlighting this. As an aside: any good voicemail boxes with a real phone number?

If I understand you correctly, I believe your're looking for something like http://grasshopper.com offers. Other alternatives would be http://voice.google.com or building something custom with http://twilio.com

Perfect, thanks for that, ABrandt.