This week Brian Krebs of Security Fix wrote Shadowy Russian Firm Seen as Conduit for Cybercrime, Taking on the Russian Business Network, Mapping the Russian Business Network, and The Russian Business Network Responds. These are great articles, that, at the very least, bring a true threat to a wider audience. This Slashdot post featured a helpful thread providing some technical details on the network itself. If you would like to try identifying some of the networks involved, my post Routing Enumeration might be helpful. Searches via RIPE could also be illuminating.
While researching this post I found a few other incredible resources. First, there's a blog -- rbnexploit.blogspot.com -- that started last month. It's exclusively about RBN. Second, I found Nicholas Albright's blog, which covers botnets. Third, there's an absolutely amazing series of articles by Scott Berinato. They are lengthy but definitely worth reading.