There's currently no keyboard shortcut to accomplish this, but I think there should be. It's perhaps a little-known feature that, as of Snow Leopard, you can use Cmd-Shift-Period (⇧⌘.) to toggle visibility of hidden files in open and save dialogs. If you'd like to see this feature in Finder too, head over to http://bugreport.apple.com and file a duplicate of radar://7096650.
Quinn Taylor
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