Here's a look at the top viruses blocked by the LBNL viruswall in January:

Myparty

Windows users: the Myparty virus (W32/Myparty@MM) is now circulating around the Internet. If a message with the subject: "New photos from my party" arrives in your mail queue, don't be fooled. The message contents direct those who receive it to go to www.myparty.yahoo.com. If you try to go to this site, instead of going to what appears to be a web address, your system will run an attached executable file that will infect your system.

Identifying marks:
Subject: "New photos from my party"
Message: "How are you? When I saw this screen saver, i immediately thought of you. I am in a harry, I promise you will love it!" www.myparty.yahoo.com
Attachment: "www.myparty.yahoo.com"

For more information.

Shoho

Windows users: Shoho is an email worm that spreads by sending itself through an email attachment. The worm also can send out other files (steal information) and perform destructive actions. Email addresses are obtained from the files on local disks with those extensions: .eml, .wab, .dbx, *.mbx, *.xls, *.xlt, *.mdb. The worm has a destructive payload -- It deletes all files in the current directory. It can also delete files in the Windows root directory after rebooting.

Identifying marks:
Subject: "Welcome to Yahoo! Mail"
Body: "Welcome to Yahoo! Mail"
Attachment: "readme.txt <lots of spaces> .pif"

For more information.