The best and worst docks for Ubuntu

Docks became popular when Mac began using them in their operating system. But these days docks are available on all platforms.
So which ones should you avoid and which ones should you use?

Picasa

I don’t know for how long, but it seems picasa (2.2 and 2.7 beta) is available for linux.

Vista Transformation Pack

Most linux users prefer Ubuntu over MS Vista (duh!), but some of those users like the vista theme very much.
Like the vista transformation pack for MS XP, there is now one for gnome to.
Including wallpapers, vista sidebar, emerald themes, …

Some gnome candy!

Keep reading for the candy.