Though this site isn't specific to World of Warcraft, MMOGCHART.COM
provides some interesting information on the subscriber levels of
various MMO's currently on the market as well as the number of people actively playing MMO's. The site has
recently gotten its first update of the year, with promises of more updates to come. It doesn't tell us more than
we already know - that World of Warcraft is immensely popular - but it does help to put it in perspective. With
the next two MMO's below WoW catering to more of the Asian market (NCSoft's Lineage and Lineage 2), it looks like North
American competition in the MMO market is pretty scarce.