If you are interested in 2012 prophecies, this is one which I find appealing.
Time Wave Zero - a graph depicting events in past and future.
How it originated -
....and the detailed graph for this year is in the thumbnail below.
The graph shows 'ever increasing novelty'(marked by
descent of the line) until it descends to the baseline in December.
i.e. - more and more novel things are happening until 'ultimate novelty' is reached, and the graph ends (just as the Mayan calendar ends).
This is not doomsday prediction, any more than the mayan calendar doesn't predict the end of the world.
It is likely that how we chart 'time' will change, which could well be due to development of time travel - we won't know until we get there.