The most obvious characteristic of one of the spam runs in the use of a malware landing page containing .ru:8080, registered through NAUNET to the infamous "private person". In order to aid researchers, I have labelled this series as RU:8080. You can see some current nastiness in action at Malware Must Die.
But there's a second spam run as well, which appears to be similarly themed but using different servers. In this case, the domains registered are typically .net, .org and .com emails (with .pro and .biz used from time-to-time). These domains are registered with fake names and addresses purporting to be in the US, but indicators show that this spam may well originate from within Russia.
Amerika (yes, there was a TV show of the same name) because frankly the domains are about as American as
I don't have any deep insight into either spam run or the payloads they deliver, but if you are interested in looking more deeply at the patterns then hopefully this will be of some use!