There is a new virus being spread, W32.Novarg.A@mm, that is a wrom designed to allow for serious spamming. It opens a port on a machine and allows the attacker to run arbitrary programs on that machine, which may include spam-sending engines, or programs that can destroy your data. It infects you by looking like an administrative e-mail.
We've already seen several infection attempts at DBR.
Please download the latest anti-virus software of your choice, and keep your machines clean!
Further note: It may not be used to spam; there are reports that it is performing a denial of service attack on SCO.