PC World: "Do a search at Google today and you'll see a new link at the top of the page, "Show options..." That link opens up a whole new set of search tools that look like they'll be spectacularly useful and even a little fun.
The tools let you find only results published in the past day or past week, find only results in forums, find only reviews, or get a sneak peek at the images on the pages in your results. In addition, there are a couple of new ways that Google presents results visually. You can choose the Wonder Wheel, a visual search result that shows your central topic in the middle with spokes going out to related topics around its circumference. Or you can choose Timeline, which shows the number of mentions of your topic through history, and not just the Web's history."