Wikipedia has a great list of past false alarms and prophesies of upcoming decimation, so take a look to go down apocalyptic memory lane and to mark your calendars for future "the end is near" pontificating.
Also, if you haven't already, check out my early essay, "Crying Armageddon," which sums up my thoughts on all this cyclical doom and gloom nonsense.
I leave you now with the words of that great R.E.M. song: "It's the end of the world as we know it, and I feel fine."
See you (hopefully) later.