network adaptor is released tuesday the 27th. its 40 bucks.
generally, there is no fee for online games. the only games that will charge fees (so far) are final fantasy XI and everquest, neither of which i have any desire to play. the only expense is 40 bucks for the network adaptor and your internet service provider.
the only catch to online gaming ive seen is with madden. with madden nfl 2003, you can only play it online until august 31st, 2003 (when madden 2004 will most likely be released). thats not too bad of a catch, though.