http://gizmodo.com/5824503/anonymous-bitcoin-purchases-arent-actually-anonymous

I know people are going to zone in on the attack on anonymity, but ignoring that, given that most of us had knew this anyway, have a look at the white paper, some awesome graphics of the network.

http://arxiv.org/PS_cache/arxiv/pdf/1107/1107.4524v1.pdf