to hold you over till WoW i reccommend Dark age of camelot.
http://www.darkageofcamelot.com/
not only is it fun but it has a great structure, gameplay, and variety.
it also has a very friendly and engagin community both in game and outside.
camelotvault.ign.com <--- has news/info on it plus you can also find the community forums there if you want some more info.