Here’s a very good primer on the Wikileaks project.
Assange is in the cross-hairs of a lot of very large and powerful entities including various governments and corporate interests. In fact, it is difficult to think of a precedent case of so much activity from so many quarters bent on suppressing or destroying a publishing enterprise (which is what Wikileaks is, of course). The reason that Assange and Wikileaks have gained such an unprecedented level of attack is because they pose a profound threat to existing power structures in the world. Watch and, I would ask of you if you think this important, to pass it on to as many others as you can.