In my experience every type of fanatic or radical believer in a given idea also has their own varient on the Rapture.
For instance, the most commonly understood Rapture (at least in the USA) is the Original Rapture. That of Jesus coming down from heaven to take up all those who believe, leaving behind the sinners to dwell in a world where the anti-Christ reigns with fire and brimstone falling from the sky on a regular occurance. Plagues, and whatnot.
http://en.wikipedia.org/wiki/RaptureBut there are others, and while I am somewhat generalizing here (about the types of people who believe certain things), this is what I believe people expect from the Rapture, or from The Apocalypse.
First, is Nerd Rapture. The Rapture of the Nerds is, The Singularity, as envisioned by Verner Vinge, and Preached About by Ray Kurzweil. Basically the belief is that at some point in the near future, the world will change as Machines Achieve Strong Artificial Intelligence, and are able to Exponentially Advance themselves, allowing everyone to become immortal, live in their own virtual universes, do whatever they want.
http://en.wikipedia.org/wiki/Technological_singularitySecond is my most favorite, the Primitive Rapture. This Rapture is seen by many Spritualists or some Pagans as The Global Collapse. That is, Peak Oil occurs, The End Times Near, Nature Strikes Back, and so on. Many "Primitivists" believe that this is the Final Judgement of Nature, and that Human Civilization, the Evil that has Scourged The Earth will finally be met with a force it cannot reconcile itself with. And Everyone Will Live in a Primitive Utopia Away From The Evils of Work and Drudgury of Conumer Society.
http://en.wikipedia.org/wiki/What_a_Way_to_Go:_Life_at_the_End_of_EmpireOne Key Tenent of these Beliefs is that, essentially, only the Good Survive. Even the Nerd Rapture presumes that Good will Conquer Evil, and that Benelovent Artificial Intelligence will Win The Day (despite that evolution has shown that more powerful species always conquer the weak). The Primitive and Christian Raptures believe that if you are "Good Enough" you'll be OK at the End Times. The former you Learn to be a Survivalist, and the latter you Get Swooped Up Into Heaven.
Now try as I might I can't think of other types of "Rapture." Can anyone tell me about other Religious Raptures and perhaps expound on any errors I have made here?
I think Rapture is interesting, and I'll be honest, if any of them are reasonable I wouldn't mind the Nerd one. I'd love to live until Epoch 3 of the Universe (Where the Local Group forms into a Super Galaxy a trillion years from now). But that's just dreaming. :)
(Note that I'm not a "believer" in the Nerd Rapture in that I think Kurzweil is wrong about the exponential curve. It's just a cute thought.)