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Re:List of hidden OS X features, tips and tricks by cstuder on Monday June 24, 2013 @05:25AM (#5931876)
You could click on the translucent bar button on the top right of a DMG-window, then you get the sidebar on the left back.

But apparently it's been removed in Lion: http://myintarweb.com/dispatch/lion-tip

Re:List of hidden OS X features, tips and tricks by protitap on Monday June 24, 2013 @05:45AM (#5931930)
Command-Option-T is the equivalent key combination.
Re:List of hidden OS X features, tips and tricks by lloeki on Monday June 24, 2013 @12:28PM (#5933963)
> the translucent bar button

a.k.a "the pill".