This video is a great interview with Marc Andreessen.
He talks about his companies, his joint ventures and investments.
He is on the board of facebook, ebay.
He talks about his company ning, twitter, facebook and their monetization, and fall of newspapers.
Any tech entrepreneur already knows this, but ‘how to do micro innovation’. You write your apps, and run them on cloud computing up on amazon.
I heard about one model, using adwords to research ahead of building a product. See the demand, for a small cost, BEFORE you build.