Google's asking searchers to go ahead and kick the tires on its new search infrastructure, dubbed Caffeine. Most users won't notice a major difference in search results, but testers will help them speed up and diversify their algorithms.
In a blog post, Google says its new system works "under the hood," and marks an attempt to improve "size, indexing speed, accuracy, comprehensiveness and other dimensions." Google Operating System finds that the results are sometimes more related to recent events, while Search Engine Watch blog offers side-by-side screens, noting that the SearchWiki icons are gone, and a few in-house promotion links are moved around. In our own tests, a few results for "lifehacker" came out different, but it wasn't immediately clear if they were actually better. If you try out Google's new code base, tell us what you find and what you like (or don't) in the comments.