Deskspace is a very nice software and i would suggest it. It isn't as customizable as CubeDesktop but it is better in that the trial is much longer than CubeDesktop.
If your looking to buy this... More
Very nice desktop manager available in many languages. It doesn't require installation - just unzip and run. Changing between desktops is easy and - most importantly - funny. :-)
My only problem... More