Tab bar on right
The tab bar can be on three sides of the window, why not on the fourth?
Firefox's "Tree Style Tab" addon supports all four sides.
I love tabs on the left, the only disadvantage is that the actual terminal area jumps by a lot when opening the second tab. This problem wouldn't be present with right side tabs.
I'm not sure I would switch, but it'd be cool to have this feature for completeness.
I saw one of my colleagues having the terminals tabs on the right, I think he uses roxterm.