A few months ago while logging into Windows, I was surprised to find a pop-up from AVG Free announcing its cease of support for the 7.1 version starting 15 January 2007. I misread it and thought that Grisoft won't release updates for the free edition of the antivirus anymore.
What I misread was that AVG Free 7.5 has been released and will replace the 7.1 version among Grisoft's line of AVG Free Edition. That's quite very generous of Grisoft.
For Windows, as well as Linux users, you can download AVG Free Edition here.
(I haven't tried its professional ed.)
good