Just a few comments on BitDefender's good product range, not part of contest.
Something I think is great BitDefender is their total security solutions. I believe that broad security functions (ie: anti-malware, phishing and SPAM protection, firewall etc) are necessary and preferable if it is in the same product as the product is more likely to play well with the other functions than different solutions from different vendors.
BitDefenders Total Security however includes more such as parental controls, encryption and even backup (including online backup) et al.
But of the new features I like most about BitDefender Total Security 2011 is the performance optimizer and gaming mode. I don't do a lot of gaming but there are other times when this mode is handy and performance is paramount these days.
I might also add that BitDefender has a broad range of other solutions including Mac and mobile platforms (the mobile solution took me a while to find a while ago however but is is there).