+1  A: 

Change the ComboBox "RightToLeft" property to TRUE.

Note: The drop-down arrow will now be on the left side of the control.

JTA
I should have mentioned, I tried this and didn't like the look of it.
Cheeso
+3  A: 

It is but you would need to ownerdraw the combobox yourself so you can align the text see http://social.msdn.microsoft.com/forums/en-US/winformsdatacontrols/thread/0438b63a-5f6b-401c-8ea9-cd9e950ed6e1/ for more information.

olle
+1  A: 
Cheeso