I prefer gnome to KDE but I don't know what this is but I thought I might give it a try. If anyone knows what this is and where to get it, please let me know, thanks.
http://www.tomshardware.com/gallery/ubuntu-linux,0201--6247----jpg-.html
I think it's either Docky or CairoDock that's been used to replace the standard desktop bars in Gnome. I'm quite happy with the default Gnome look, so I've never tried using either of them myself. Consequently I don't really know much about them.
Your best bet is probably to do a bit of googling about Docky and/or Cairo Dock, then install one of them and have a play!
I don't think you can have both installed at the same time, I think it's a case of having one or the other. But I could be wrong!
Cheers for now,
Jas.