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Re:Tim O'Reilly: I am really starting to hate Mac OS X. by mturmon on Sunday November 13, 2011 @12:21AM (#3230034)
Someone wrote a little app that toggles it, but honestly, if you care that much about it to ask, just leave the hidden files visible all the time. I've found it to be the path of least confusion.
Re:Tim O'Reilly: I am really starting to hate Mac OS X. by davidcann on Sunday November 13, 2011 @12:46PM (#3231279)
This widget works great for show/hide hidden files:

http://www.apple.com/downloads/dashboard/developer/hiddenfil...