BumpTop for Mac

I came across something you might find of interest called BumpTop, an alternate desktop for the Mac.  It has been around for Windows for awhile but has just been released for the Mac completely re-written for the Mac platform.  Here's a picture of the one form of the desktop:

I found this on a site I follow called Mashable.  It seems that BumpTop is free, although there is a Pro version which costs some money with more features, particularly for related to the newer mousepads. The Mashable entry is here and the BumpTop website is here.