Visited Google.com lately? If so, you might have spotted something a little different about Big G’s home page.

Remember back in September when I blogged about Google increasing the size of the search box? Well it turns out that Google have been experimenting quite a bit with the layout and design of their home page, playing around with different versions of it, visible only to a handful of guinea pigs in their control group and users of a few select data-centers.

A major feature of the home page testing (and one that exists in the final launched version) is a fade-in effect where the content on the page “fades in” over a few seconds. I had noticed the fade-effect a couple of times during October and wondered if it was a glitch. TechCrunch noticed too and blogged about it quickly.

With the testing period over, Google officially launched their new home page across all datacenters and most regional Googles this month. When the page first loads, it shows only the Google logo, buttons and the search box. The remaining links appear only once the user moves the mouse over the page.

Google’s VP of Search Products Marissa Mayer says this design provides a focus on site usability:

“For the vast majority of people who come to the Google homepage, they are coming in order to search, and this clean, minimalist approach gives them just what they are looking for first and foremost. For those users who are interested in using a different application like Gmail, Google Image Search or our advertising programs, the additional links on the homepage only reveal themselves when the user moves the mouse.”

Google hopes that the minimalist page will soon become second nature to users and encourage them to use the home page features more efficiently.