Back to the initial topic... I did get an updated clamav yesterday on my home system.
Checking at work with the same repos (except Debian multimedia) I don't see updates to clamav packages as of 14:58:23 UTC 2011. 0.97.1+dfsg-1~squeeze1 is the package version I have at home. The site : http://packages.qa.debian.org/c/clamav.html shows stable-updates should have the newer version. Perhaps the repos are taking awhile to get updated. --Donald