With service pack 1 being released during SQL PASS Summit 2012, I did not get the chance to update my personal laptop.  This is great timing as I have just purchased developer on my laptop.  You can download the slipstream version or just the service pack separately.  Are you curious as to what is new in SP1, then check this link out?  It is also a good idea to read the release notes, which I always recommend but rarely do, unfortunately.  It is similar to reading the directions, men rarely do that.

Here is the visual upgrade guide, quite simple really, so much so that even I can do it.

The update completed easily and successfully.  Enjoy!