As a part of our continuing effort to make the control panel simpler without taking away any of the flexibility and advanced features of our system, we have removed the Columns control panel.  The two features prevously found in this control panel (Column Layout and Site Alignment) have been moved to the Customize control panel.

Most users will want to use the Column Layout and Site Alignment that goes with the Theme they select, so these features are really more for the advanced user, and no longer warrant a control panel of their own, but are of course still available for anyone who would like to take advantage of them.