The original website:
http://qntm.org/destroy
Methods for destroying the Earth
Fissioned
Sucked into a microscopic black hole
Cooked in a solar oven
Blown up by matter/antimatter reaction
Sucked into a giant black hole
Meticulously and systematically deconstructed
Pulverized by impact with blunt instrument
Hurled into the Sun
Ripped apart by Jupiter
Fall-back methods
Total existence failure
Written off in the backlash from a stellar collision
Crunched
Torn a new one
Decayed
Other, less scientifically probable ways that Earth could be destroyed
Whipped by a cosmic string
Gobbled up by strangelets
Engulfed in supernova
Shaken to pieces
Reduced to true vacuum
Wormholed
Existence negated via time travel
Destroyed by God
Things which will NOT destroy the Earth
Overspun
Gamma Ray Burst'd
Burned away by muon-catalyzed fusion of the oceans
Blown up by vacuum energy detonation
Armageddon, as described in the Bible.
Allowing George W. Bush to continue to exercise his will on the world.
Paradoxes as described in Back To The Future Part II.
Ceasing all thought
Semantics.
Adding enough material to the planet Earth to cause it to undergo gravitational collapse and become a star instead of a planet.
Detonating all the nuclear weapons ever created simultaneously
Proving that 1=0.
Runaway fission at the Earth's core
Gay marriage.
Another comprehensive list here: