Google's next version is up for testing. It doesn't look different, but the results may vary from what you get at old Google.

From Google today: Help test some next-generation infrastructure

...Right now, we only want feedback on the differences between Google's current search results and our new system. We're also interested in higher-level feedback ("These types of sites seem to rank better or worse in the new system") in addition to "This specific site should or shouldn't rank for this query." Engineers will be reading the feedback, but we won't have the cycles to send replies.

Here's how to give us feedback: Do a search at http://www2.sandbox.google.com/ and look on the search results page for a link at the bottom of the page that says "Dissatisfied? Help us improve." Click on that link, type your feedback in the text box and then include the word caffeine somewhere in the text box. Thanks in advance for your feedback!