Whee... New virus out - Fbound.C-mm. It's a mass mailer that's just an executable, but seems to be missed by most virus scanners by having a base64 encoded attachment that's all one long line - whereas the RFC mandates 76 character long lines. Of course Outlook dutifuly decodes it.
Looks like this is going to be the first huge virus this year.
Update: Attachment is called "patch.exe". Block at your gateway if you're in charge of one.