Eset Smart Security claims to protect against the same things as Norton 360. I don't know anything about it because I only have NOD32 Antivirus and antispyware ;
http://www.eset.co.uk/smartsecurity/index.php
The AV is very light on resources and gets good ratings on AV Comparatives. For some reason ESS gets a very poor rating at Matousec, but that is a firewall testing site!