Now that the Web 2.0 conference on Internet companies has come and gone, and at least a dozen start-ups have launched — and the energy has been stuffed into us, and then sucked out again — we’re wondering where you think we stand. Most product introductions, as expected, were incremental. But what was the most significant development in your view? Or broader, what is the most exciting technology driving Silicon Valley innovation right now? Or any other random thoughts? Take it away. Please add a comment, and we will read it. This is the launch of the so-called open thread, a feature often used by our colleague, Dan Gillmor, to great effect. If it is useful, we will do more of them.