Some of the certifications basically charge a lot of money just for certification, the avast.com home page shows some, see image.
The three previous av-comparatives were Advanced and the retrospective test can throw up some what I would call anomalies as I believe it is based on not updating the software for three months and users just don't do that.
Nod32 has very good detection rates, but you also have to compare functionality also and not detection alone.
Web Shield, Network Shield, Internet Mail scanner for general POP3 email clients, like Outlook Express, Thunderbird, etc. Outlook/Exchange plug-in for MS Outlook, P2P Shield, Instant Messaging protection.