Facebook has been
testing a new design [webmasterworld.com] for some time, and it now starting to roll it out to a wider audience to test. If you're not offerend the design, you can get to it from the settings menu and "see new facebook" option.
If you want to return to the old design, select "switch to classic"
Eventually, the new design will be rolled out to everyone, so it's worth a look for Facebook users.