Virus Alert: There's a new one out there that can be particularly tricky. Here's the description from Symantec:

Subject of email: Randomly generated text that can be up to 60 characters long.
Name of attachment: One randomly named infected executable and several randomly selected text or document files.

In other words:

There is nothing "standard" about the email you will receive except it will contain an "executable" attachment.

How to avoid this virus (and a bunch of others as well):
1) Think before you click. As a rule you should always avoid attachments that end in:
.exe .com .bat .pif .scr .vbs
No discussion. No exceptions. You click an attachment that ends in one of those three letter - it runs. That's bad. These are things that are executables.

2) Does the message you received make sense? Ask yourself - is this something I should have received from this person? If it seems like a random message or a vague message - be very wary.