We have been advised by F-Secure of some new variants of the Balge virus entering the wild - I was reminded today after our anti-virus software detected one.

The virus is sent by email and usually has 'tax' , 'taxation' or something related to that either in the subject line or an file attachement name.
For more information including detection and removal tools, http://www.f-secure.com/v-descs/bagle_cf.shtml