Nothing revolutionary, just some little changes:
http://picasaweb.google.com/milivella/GoogleSNewLayout#

do YOU get the new top bar?

I have had that for... awhile at least, not sure when it started appearing.

Let's call it the navigation bar (aka navbar, from 2007 http://googlesystem.blogspot.com/2007/03/google-tests-new-design-for-homepage.html). They've run experiments for few months with this design:
2010-09-02 http://googlesystem.blogspot.com/2010/09/google-tests-new-navigation-bar.html
2010-11-09 http://techcrunch.com/2010/11/09/google-com-top-nav/ (with colors, similar to milivella's)
2010-12-07 http://techcrunch.com/2010/12/07/google-plus-one-pic/ (with Google +1/Me)

TOMHTML: Don't know if the question was for me, but it was a incognito session, so I haven't the new experimental bar anymore.

Jérôme: Thanks for the info. I know that I should have checked the some sites (well, at least Google Operating System...) before posting!