Online game logging and communication system Xfire, has released some interesting statistics about the games most played by users of their service, much as VALVe does with system specs of Steam users.

The statistics, available at the Xstatics website
show developers Blizzard absolutely dominating almost all categories, thanks to both the phenomenally popular World of WarCraft, and also the older RTS, Warcraft 3.

On the MMORPGs tab of the site, it is interesting to see a large amount of the totally free MMOs in the charts, even if they are far behind Warcraft, FlyFF and Silkroad are two such examples of completely Free Games that are challenging for high places in the Xfire charts, even above games such as City of Heroes, and other big pay to play games.