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I ran across this article on Daring Fireball while checking out the non-Apple kernel extensions in the /System/Library/Extensions/ folder on my Mac. The article is ancient history now, but it's still useful and worth reading, especially if you're new to OS X. Also, the comments by Dean Reece on lists.apple.com are still available.
Looks like the rules for building and installing third-party kernel extensions changed for OS X 10.9 (Mavericks) and later. Details at http://asciiwwdc.com/2013/sessions/707. Sorry for any confusion.