Hey,
This is a very newbie-friendly website that explains bitcoins and also have links to the must-know-of bitcoin related sites.
There's also a new Bitcoin mining calculator there too, that seems to be the most advanced on the market so far @ http://www.coinish.com/calc/

There is no possible mechanism that can be used to trace a Bitcoin transaction back to the buyer or seller. This anonymous characteristic of Bitcoin makes it very popular among privacy concerned people around the world.