As you have noticed google has changed general feel of their search page to more modern, web 2.0-looking. Click on the image below to see old and new version compared.
No big deal you might say, were actually it is. I have seen portals noticing magnificent differences in number number of visitors after such changes. changes not always beneficial. Even one portal which gave the position of leader on account of competition for that reason.
As simple research of website eye tracking (available here) in slightly different area shown it is not all random and just to look nice. Just something to be aware of.
More you can find on Official Google Blog.