PHP on IIS 7

Here's a great resource for installing PHP/MySQL on 2008/IIS7:
http://edge.technet.com/Media/Installing-PHP-Applications-on-IIS7/

Also, very important - to get detailed error reporting, run this from the command prompt:

%windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpErrors -errorMode:Detailed