Glx-Dock (Cairo-Dock) is fully themable, and you can really make your dock behave and look totally different from any other dock.

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http://linuxlandit.blogspot.com – GLX-Dock is now built on top of libgldi (for GL Desktop Interface),which will also be used for another project: GLX-Desklet. Having aminimalistic core ensure better stability and performances, and lessbugs. It is compatible with Compiz-Fusion, Beryl, Compiz, Metacity, Kwin,Xcompmgr, etc., but it can also run without a composite manager (usingfake transparency). Glx:dock can run under GNOME, KDE and XFCE. The latest stable release is the : How to install it here.  Updates: What`s new in GLX-Dock2.3Of course a lot of new features come along with this new version: - The Syste (HowTos)