Last month I had a change to goto Microsofts WebDev07 conference. I haven’t gotten around to doing a write up but Travis did a good one if your interested in what Microsoft has to say to a bunch of PHP guys.
One of the projects I found out about while I was there was fastcgi support in IIS. If your running PHP on windows with IIS this is a pretty big deal since it gives you a stable high performance way to run PHP. I also think its important because its real engineering time by Microsoft on the on project, a real commitment to PHP.
You can grab the bits at: http://www.iis.net/php, this release is fully supported by Microsoft which is also kinda nice.
It would be interesting to see some benchmarks comparing the new fastcgi stuff against your other PHP on windows options, but its doubtful I’ll run them since I run all my production on linux.