Google’s announced some new options for search, including topical, content-type, and chronological filters, as well as an ability to explore related terms.
Additionally, rich snippets bring structured data to the results page, based on data provided by Microformats or RDFa. A clear call from Google:
We can’t provide these snippets on our own, so we hope that web publishers will help us by adopting microformats or RDFa standards to mark up their HTML and bring this structured data to the surface. This will help people better understand the information you have on your page so they can spend more time there and less on Google.