And I suggest using silver anti-seize compound on the stem's bolts/threads and on the part inserted into the head tube, instead of grease. These uses are exactly what that stuff is made for. Lasts longer, works better, and attracts less dirt.
I can't agree regarding the use of graphite products such as Permatex Never-Seize on the seatpost or the handlebar stem. The stuff is perfectly suited for the bolt threads, but not on the surfaces that are inserted and contact the steel portions of the frame.
Standard grease works best on said surfaces. Never-Seize does its job too well - you'll never get your seatpost or stem tightened to the point where they don't move (heck, it is called "Never-Seize," after all). You'll wind up with snapped binder bolts and warped steerer tubes if you keep this up.
Ideally, if someone could develop a friction grease with suitable properties to prevent the bonding of the two dissimilar metals, we'd have the most ideal grease ever developed for the purpose.
-Kurt