I spent many hours compiling a list of very helpful MBZ related web sites at work and the damn company went belly up and my list with it. Surely, if all of us contributed their favorites in this thread, it would be a worthwhile effort. Obviously, none will be as good as mercedesshop.com, but sometimes second best is good to know about. Here is one I just came across that has many links: http://www.slack.net/~thundt/mercedes/
and for you folks with older cars or do restoration, you might like: http://www.adenauer300.com/
Please add as you can.

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'76 240D-Sold
'78 240D-Sold
'85 300 SD, 165K-Sold
'88 300 TE, 165K-Sold
'64 Porsche 356C Cabriolet- under restoration
'86 560SL 124K Miles-Sold
'94 320E Wagon, 74K Miles-128K Miles JUNKED
'06 E350 Wagon, 84K Miles
07 SL550, 14K Miles