Quick update: Unity patched to support minimize on click for the Launcher is now available for Ubuntu 11.10 Oneiric Ocelot users too. We've already talked about Unity with minimize on click patch a few days ago so check out that post for more info (including a video).
To add the PPA and install Unity with minimize on click, use the following commands:
sudo add-apt-repository ppa:ojno/unity-minimize-on-click sudo apt-get update sudo apt-get upgrade
After the upgrade, log out and log back in.