Let Emacs spell-check your code
I just discovered flyspell-prog-mode. It works on comments and string constants in your code.
You can enable this mode automatically by doing something like:
(add-hook 'c-mode-common-hook '(lambda () (flyspell-prog-mode)))
Note for OS X users. It uses ispell, which does not come with OS X. Fortunately that is easily solved by using the MacPorts.

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