Much work to do for SEOs: Google announces extended crawling by handling HTML forms on websites in order to get to those pages that would be reachable only by user interaction. This is a try to make these parts of the web visible that are still unavailable to crawlers that simply follow links and don't know how to handle things like the target attribute of forms. It will be interesting to see how Google handles the result lists, because the offered links would possibly result in HTTP POSTs and GETs and I don't know if every web application out there in the wild will tolerate this. But for SEOs this will be the next bonanza, that's for sure! (Source)