I've been doing some tests with IPv6 on Windows lately.
I wrapped some of my tests, discoveries and impressions in a technical article:
http://www.muscetta.org/research/papers/IPv6ISA2004.html

Disclaimer

I've just spotted this *wonderful* article :
"Consuming MapPoint Web Service in PHP"
http://msdn.microsoft.com/mappoint/mappointweb/mappointwstechart/default.aspx?pull=/library/en-us/dnmapnet30/html/MWS_PHPLoc.asp

which shows how to interact with MapPoint Web Service from PHP code.
That's awesome, as that's the most cool characteristic (IMHO) of web services: you might want to use them from your language of choice, and that CAN be done, for TRUE interoperability :-)