Here is a great article that explains more in depth why 2011 looks to be the year of the Tribulation (and by association, the Rapture). Read the whole thing. Some of it might be rehash, but other points you might not have known -- like how the lunar cycle from 2011 to 2018 fits the timeline of the Tribulation in the Book of Daniel.
http://endoftheworld.net/Jesus/?cUk4pWab
~~Becka