Don indicates his trials in finding the SOAP 1.1 spec now that http://www.w3.org/TR/SOAP appropriately points at the latest 1.2 spec. I ran into the same problem on MSDN. Seeing as I had neither a mirror or Don's tattoo (and although I heard about his blog post, I hadn't visited), I guessed http://www.w3.org/TR/SOAP11/ and it worked! A little easier to remember than http://www.w3.org/TR/2000/NOTE-SOAP-20000508/.
This should be fixed shortly on MSDN.
Of course when SOAP 11.0 comes out I may have to update my link again. :-)