Hey wondering if people can help me out... I'm trying to get information on how many people actually play online games. Server stats for example, showing who's online at any one time.

Steam is excellent at this, it has just the info I'm looking for:
http://steampowered.com/status/status.html

I would have thought that WoW would have some forms of stats, but all I can find is this, which is kind of useless:
http://www.worldofwarcraft.com/realmstatus/compat.html
Is there a site with accurate stats?

This is extended to all online games, popular or not... I'd appreciate any info you can have on this software usage.