I'm on the Sophos mailing list but I have a couple of issues with it:
1) Sophos uses a different name for viruses than everyone else. (Mind you, I think every anti-virus software provider has their own naming system)
2) The e-mails give no information about the virus. You have to visit the Sophos website for virus information, which for 5-10 notifications / day is very manually intensive.
I appreciate it's straight forward to research a virus on-line, but generally when you're faced with an infected machine going on-line is the last thing you want to do. (And not everyone has more than one machine available to them)