AVG Fakes User Agent, Floods the Internet
Just to comment that this has been working flawlessly for me and others for days.
In addition to much reduced load, AVG will be getting the combined load with an appropriate message in their logs.
Note it's quite safe for valid IE 6.0 users as it checks for very specific user agent strings that most IE 6.0 users don't in fact have.
In addition the referrer must be blank and the Accept-encoding header must be missing.
Also I'm using a 307 redirect so so that potentially non linkscanner clients will keep checking the latest rules.
This also allows you to change the redirect destination without worrying about cached old redirects.