Are *any* games as popular as World of Warcraft?

[Dan Kegel]

I spent some time noodling around looking
at what games are really popular (I wouldn't
know firsthand, I don't play much).
There's some data at
http://www.amazon.com/gp/bestsellers/videogames
(click on PC Games).
I tried to cross-check titles with Google Trends to
see which ones seem enduringly popular, but I
haven't found any that beat World of Warcraft yet:
http://www.google.com/trends?q=world+of+warcraft%2C+guild+wars%2C+tomb+raider%2C+bioshock%2C+half-life+2

Is Google search popularity a bad measure, or does it
reflect the public's mood well?
- Dan