For now, here's how to change the maximize, minimize, close buttons to the right hand side:

gconftool-2 --set “/apps/metacity/general/button_layout” --type string “:maximize,minimize,close”

If you're not using one of the 10.04 themes, you can use this to put the buttons back in the 9.10 order:
gconftool-2 --set “/apps/metacity/general/button_layout” --type string “:minimize,maximize,close”

Let's hope we have a graphical option for this in the 10.04 final release.