It’s pretty clear that Google doesn’t subscribe to the philosophy of “if it ain’t broke, don’t fix it.” The company is currently working on a massive, yet subtle, overhaul of its search engine technology. The code name for the project is Google Caffeine, and you can start using a preview version of it right now.

If you click that link, you’ll see a search engine page that looks amazingly similar to the current Google page. In fact, it will look identical apart from the URL. That’s because the Google Caffeine project isn’t about updating Google’s user interface. Instead, the company is trying out new ways to index Web sites and organize them for searches.

Google developer Matt Cutts blogged about the project on Monday. Cutts explains that casual users won’t really notice a difference in their search results and even power users may find differences to be hard to spot. Cutts points out that search results will change but it may take an eagle eye to notice it.