Hey folks,
Just a quick post -- our friend Chris at Ecube in the UK is working on this challenge as well, and he has provided some great, documented work-arounds for this issue of Web clients with Norton Internet Security installed and compressed content from the Web server... check out his research at http://www.ecube.co.uk/docs/norton.html.
Chris has seen this issue affect compression beyond the NIS + ColdFusion + IIS 6 compression challenge we documented, so please do take a read.
Cheers,
Port80