A new version of GNOME-Do was just released a few days ago. I already tried it and the new Docky is quite a nice idea. Docky is the new big feature in Do, which offers a panel with starters on it. It's already quite nice to use, and almost ready for productive use. If you already like Do you should give it a try! There are already packages for most Linux-Distros, even a repository for Ubuntu. Have fun!
Note: You have to resart the Do-Deamon before the new features are available.
I also made a Screenshot: