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XKCD already covered this:

http://www.xkcd.com/936/

It's a lot easier to remember a simple phrase of four random words than a bunch of symbols and remembering which letters you capitalized or not. And I'm not sure how a dictionary attack is going to work against a cluster of words, you'd have to guess all four words at the same time, you either get the whole password or nothing at all, that's how encryption works.