VeeshanVault

http://rocketdock.com/

Works quite well actually. Quite robust when it appears that there's only 2 people behind this project.

Hopfully Apple doesn't sue em.

I've tried this off and on over it's past few releases. It seemed fairly stable but I ended up not using it (or any other dock) as I found I wasn't using it and prefer sticking all of my apps in the quick launch part of Window's task bar.