this thread comes up alot and the responses are usually the same
the most popular classes are druids, wizards, and monks. not to say a few of the high end raiding guilds dont need wizards but they are very popular. then come necros and mages, warriors, and shadowknights, shamans and clerics. the least played classes are paladins, enchanters, bards, and beastlords. with so few people playing on the server in general, however, whatever class you pick, you wont have much of a hard time finding a group or a guild.