There are those who believe that 2012 is when the first time machine will be deployed. Actually, in black projects (Montauk Project, Philadelphia Experiment), it is already been done. But in 2012 it will be for general public use. When it is deployed, linear time will cease to exist.
The time machine as designed in this video can receive visitors from the future who can bring information and technology that can speed up our evolution tremendously. The theory is that you cannot travel to earlier times before the first machine is built (or you have to use another technique to do so). Interesting stuff.
This professor in this video is seriously working on a time machine!