Murphy's Law - If anything can go wrong, it will.
Murphy's Law (Sex)
Murphy's Law and Other Fun - A large collection of various laws, addendums, corollaries, revisions in one big page.
Murphy's Law of the Day
Murphy's Laws Archive - Constantly growing archive. Read, randomize, and download.
Murphy's Laws for Computer Programming - Site featuring Murphy's Laws on computer programming.
Murphy's Laws [epfl.ch]
Murphys Laws of Law Enforcement - proof that some laws apply, even to law enforcement.
Random Murphy's Laws
Worst Church of Murphy's Law