Some say Norton products hog system resources, but that's not something we noticed with Internet Security 2007. It consumed less RAM than the competitors on our test PC, its scanning engine was faster, and we were able to continue using the system while a scan was running.
Norton Internet Security 2007 proved the most accurate in malware detection, picking up all the problems on our PC. It didn't raise any false alarms, but defaults to an ignore option for issues it considers 'low risk', so there's little chance of accidentally removing the wrong thing anyway.
Elsewhere there's a new, more straightforward interface. Also, the suite doesn't hassle you with constant, complicated warnings - the firewall decides itself which programs can go online.
Other features include a largely ineffective spam blocker, accurate phishing protection, and some limited privacy and parental control options. Norton Internet Security 2007 is good where it matters and deserves a look even if you're not a Symantec fan.