This month I've hid the navigation toolbars in favor of the Awn dock launcher. I'm using the Elementary theme which is light and simulates Leopard nicely. This PC has Ubuntu 10.10 installed and seems to perform a little faster than v10.04. Below is the link to get the theme.
The Elementary theme is available here: http://gnome-look.org/content/show.php/Elementary+Ubuntu?content=134164
The eGTK Leopard theme (similar) can be found here: http://dolsilwa.deviantart.com/#/d31cmd6