Started back in 1998/99 with Diablo and Diablo II - year or so
CoH/V - my last MMO - Beta til Now
Dungeons & Dragons Online - played the trial honestly love rolling dice better!!
Dungeon Runners - few days
Everquest II - 6-8 months
Guild Wars - 6 months
Neverwinter Nights - not very long
Perfect World games (played all 3) - every now and again
StarWars Galaxy's - few months
Second life.... yeah
World of Warcraft - couldn't stand it wasn't on it long
Now ---- AION!