Join Date: Oct 2009
Location: England, currently dividing my time between university in Guildford and home just outside Reading
Bikes: Too many to list here!
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It depends on a number of things. Most threads on a bicycle should be lubricated with grease simply to stop them corroding together. The same is true for the seatpost.
No lubricant is required anywhere on the handlebar, although a handlebar stem (the part that attaches to the fork and clamps the handlebars) should be greased where it's inside the fork steerer if it's a quill type.
If you have a thread-on freewheel, the threads which attach it to the hub should be greased. If you have a splined cassette system, you might want to grease the lockring threads.
V-brake bosses should be greased where the brakes actually slide onto them, because although most modern V-brakes use an internal bushing rather than using the brake boss as the bearing surface for the pivot, they can still corrode onto the bosses.
With quick-release wheels, the skewer should be greased where it passes through the axle. With nutted axles, the threads should be greased, and I tend to put grease between the axle nut and the washer underneath it, to make it easier to tighten the nut.