The new Ubuntu theme looks great [screenshot], and now the window navigation buttons are on the left. Mac users might welcome this change, and perhaps there is an argument to be made for this arrangement. Either way, I am used to having the controls on the right, and I am sure I am not alone. Switching this up is easy.
To do this, I used Ubuntu Tweak [http://ubuntu-tweak.com/]
Once installed, the setting can be found under Desktop > Window Manager Settings
Switch “place” from left to right, and the change should happen immediately.
A reader-submitted solution from Shanna:
gconftool-2 –type string –set /apps/metacity/general/button_layout “menu:minimize,maximize,close”