Building the search engine of the future, one baby step at a time | Official Google Blog

Now Google can index your email for something in addition to advertising; see the full post for more Google search updates

"Sometimes the best answer to your question isn’t available on the public web—it may be contained somewhere else, such as in your email. We think you shouldn’t have to be your own mini-search engine to find the most useful information—it should just work. A search is a search, and we want our results to be truly universal. So we’re developing a way to find this information for you that’s useful and unobtrusive, and we’d love your feedback. Starting today, we’re opening up a limited trial where you can sign up to get information from your Gmail right from the search box."

Building the search engine of the future, one baby step at a time | Official Google Blog