I’ve been thinking a lot about the kinds of businesses that will start and thrive in this economy. The bulk of web 2.0 companies were built (and bought) based on the thought that they would aggregate and re-sell people’s attention. As we moved through the business cycle, some companies developed exotic ways of targeting their users (Facebook), others used AdSense to generate a trickle of revenue, others based their businesses on driving search revenue (AVG, w3i, Conduit, Dynamic Toolbar, Freecause) and still others just left the problem for their future owners to solve.