In the world of spam, what goes down must come up.
Spam actually went down after the shutting down of the webhost McColo. Some 450,000 infected computers have been spotted trying to connect to the largest of the networks McColo hosted. A news item in BBC website.
Apparently McColo served as host to a number of “command and control” centres for botnets, networks of infected computers called bots that send spam and engage in other malicious activities. As there is no centralized command the bot owners will be looking for new hosts.
FireEye security firm has found  450,000 infected computers from one botnet. This accounts for almost half the spam in the world!
Christmas time is an active time for spam. So to fill in the gap with low spam other hosts have increased their activity. So yes very soon they will reach the old levels again. All we can do is have good virus protection and anti spam programs to combat these viruses. Is your computer protected?
I use Pareto Logic anti spam and virus protection. I strongly encourage you to get your computer protected against these vicious programs.
Check out Pareto Logic anti virus program