What's this? Answer: SketchUp has a whole new brand identity!
Check out the post by Aidan Chopra at SketchUp's official blog that explains why and how the SketchUp People came up with this new look.
While you're at it why not check out the latest SketchUp 8 maintenance release?
EDIT: Just navigating around the virtual 3D space in the new SketchUp release, using my 3Dconnexion mouse. It might be my imagination but the motion feels much more fluid to me now.
EDIT: Just navigating around the virtual 3D space in the new SketchUp release, using my 3Dconnexion mouse. It might be my imagination but the motion feels much more fluid to me now.