Well, I don't know if I've ever PLAYED in a published adventure.... I think I played through The Keep, but I'm not entirely sure. I did play the D&D 3e boxed set (came out when 3e was brand spanking new), but those "noob" adventures don't really count, do they?
First published adventure I ran was Isle Of Dread. And oh, how I love thee. I also love Hidden Shrine of Tamoachan (is it being redone for the new adventure path, or am I just suffering from wishful thinking?) and Expedition to the Barrier peaks.