Here on Astroroach we discuss our share of EOTWAWKIS (End Of The World As We Know It Scenarios), but Exit Mundi is a site that specializes in them.
From disease to grey goo, gamma ray bursts to assorted religious apocalypses, Exit Mundi cheerfully catalogs every conceivable existential risk. What's the point? Perhaps to point out how incredibly unlikely it is that we are here. I find that comforting in an odd way. Perhaps we are special after all.
I'm not wild about the site design but the content is definitely interesting, so I thought I'd bring it to your attention.