Hi all! I've been worried by the vibrations of my handlebar in my XT since I have the bike (3 months ago) I read all your post on the subject and tried almost anything, except for the vibranators, that I been ready to order next week. But I find a TOTAL solution for my problem this past saturday. I removed the crossbar of the handlebar (Hebo aluminium 22mm handlebar) and all anoying vibrations from the handlebar are gone!!
I hope that helps anyone of you guys!