I have the same problem..seems to only squeak as the car rises though. Haven't been back there yet, but maybe this weekend. Someone recommended greasing one part at a time and seeing if that fixes it, assuming there isn't something visibly in need of repair. If so, there is your problem..although in my case, I'll still have a problem getting it fixed! I am afraid of suspensions, haha.

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Dan
2005 E320 CDI - 246k
1987 300SDL TD05-16g, Herlevi pump, Elbe manifold, 2.47 LSD - 213k
Past: 1987 300D - 264k