FYI:

The Wurth application I described earlier has begun to dry up so I had to get more aggressive. For great results I recommend buying one of these, in stainless steel:

Flavor Injectors
http://www.bedbathandbeyond.com/search/search.aspx/injector/?sstr=injector&grid=20&dim=1&nty=1&

Then:
1. Suck up some moly-lithium grease into the syringe (the vacuum is probably strong enough to suck up peanut butter)
2. Screw on the steel needle
3. Inject grease into ball joint boot.
4. Creak is gone -- hopefully for a long time.

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black