Code Red summaries
It seems that the latest Code Red incident is saturated by now. Some statistics are available at incidents.org. Stuart Staniford has a model derived from the July outbreak (he shows that the growth of the worm is determined by the logistic differential equation - but note that he gives a derivation of this equation from basic assumptions), and has fitted this model into the latest numbers. Both sources indicate that about half as many hosts as last time were vulnerable.