The point underlying the first two responses: rubber bushings are not supposed to move or slip at all against metal surfaces: they are designed to absorb the various twisting and compressing forces imposed on them within the body of the rubber itself. If you grease the area where the rubber meets the metal, you create a sliding friction situation which will wear out the bushing very rapidly. This was cussed and discussed recently on the BMW list.

Paul's right on. I'd only add that you can grease the outer metal sleeves where they slide into a bracket or mating fixture, such as with the large trailing arm bushings—grease the metal-to-metal interference fit. It might ease the installation. Also, you can grease a bolt that slides through a metal sleeve—it might make disassembly easier ten years from now when you redo the bushings.

Do NOT put grease on rubber components. Oil-based grease will quickly damage rubber bushings.

Don Foster (near Cape Cod, MA)

Don't grease bushings. No need. Some greases are hard on rubber. Most bushings are not "moving parts" and have no need for lubrication. An exception is the front sway bar body mount bushings, but really only the poly ones need lube. (Use boat trailer/water proof grease - this is what IPD supplies, nasty blue green shit that is a magnet to your finest shirt, carpet, etc.)