Amazingly nerdy and helpful Snow Leopard Tip
September 16, 2009 (edited since original posting)
In Snow Leopard (MacOS 10.6), you can toggle the viewing of invisible files by pressing Command-Shift-. (period) in any Open or Save dialog box. This is great for editing configuration files! (Files beginning with a . are normally invisible)
(via MacOSXhints)
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