Dock for Linux

Using the GNOME desktop there are a few options that I have heard of, but I have only tried one. There is a program called Akamura or something and it is a dock with a crazy physic engine, but it only has a preset number of dock items and icons. What I do is just make another panel and put a bunch of application launchers in it and make it transparent and then move the stuff on the bottom panel to the top.

Now for KDE there really is a good mac dock alternative called KXdocker which acts just like an OS X dock and I have used it on my KDE desktop awhile ago.

I did a lil googling for ya and found this tutorial on how to setup a app called engage which is a themable dock for the enlightenment window manager but can work on GNOME
http://www.usalug.org/phpBB2/viewtopic.php?p=50901
http://xcomputerman.com/files/engage.mpeg

if you install the gDesklets package there is a desklet that copies the OSX dock

here is a screengrab :
http://openarch.net/blog/file/gdesklets.png

there is a similar one for KDE called karamba (or superkaramba) that you'l find on kde-look