I've just recently been experiencing what is being called messenger spam. It's when alert dialogs appear with spam messages. There's a website that's been set up to combat the whole thing here. Just to be clear, this has nothing to do with Windows Messenger or MSN Messenger.
Apparently all this has to do with the fact that I'm now set as the DMZ host behind my router, and I'd uninstalled my firewall (since reinstalled), so that my IP and Netbios were somewhat exposed. Naughty bastards. But well, if you're behind a router it's probably not really an issue. I'm still not reinstalling my antivirus.
