Call me old fashioned, but I kind of like my Gnome Window buttons to be on the right hand side of a Window, rather than on the left. Fortunately this can be easily configured using gconf-editor. Run gconf-editor and select: apps->metacity->general and then select the button_layout configuration setting and change it to:
The leading colon sets the button icons on the right of a window and a trailing colon sets the button icons on the left of a window. Easy!
If you don't want to run the GUI tool, use the following rune:
gconftool-2 --type string --set /apps/metacity/general/button_layout :minimize,maximize,close