What are the top 20 most popular computer games search engine sites?

Please provide your answers in English and with the following
information: colloquial name (if appropriate otherwise the URL only is
fine), the URL, a brief description of the service, a personal note
about the service and any additional information (perhaps why it is
popular, for example).

GameSpy.com ? Gaming?s Homepage
http://www.gamespy.com/
GameSpy has over 40 domains dedicated to games and gaming categories.
Whatever you need to find out about a game, you will find it here. All
their services are free, so there is no problems with financial
difficulties other gaming communities cause.
I have used this service many times, and am very pleased at the way it works.
Hundreds of only the best sites are hosted with each domain GameSpy
owns. That means your peers are also participating in this gaming
community. GameSpy monitors the sites so you can be sure what they are
saying is true about the games you are looking for. I was personally
hosted by http://www.planettribes.com/ (a domain owned by GameSpy) but
am no longer hosted because I have stopped playing the game.

I know this is not the top 20, but this site could be considered 20 in
itself. I hope you can find that list of 20 you have asked for.