I've said before that Server Core will make a very cool low footprint PHP engine. Here's a How-to that details configuring server core with MySQL and PHP.  Nice work!

Dennis Chung - Windows MVP: Server Core + IIS7 + PHP + MySQL

IIS 6 to IIS 7 Migration planning is starting up in full swing as we approach RTM for IIS 7. For those of looking for a mapping of IIS metabase to IIS 7 applicationhost.config settings, here's a really excellent document published by the IIS documentation team.

http://msdn2.microsoft.com/en-us/library/aa965021.aspx

A (IIS 6.0 Metabase Property Mapping to IIS 7.0)

Cool!

Here's a new IIS Manager add on that allows you to backup and restore config using appcmd. Nice add on!

: IIS7 - Backup Restore UI Module

The IIS team has release the RTM version of FastCGI for IIS 6. If you're running PHP on IIS 6, or would like to - this release is key for increasing performance and reliability. 

IIS.net : FastCGI Extension for IIS6.0 - RTM : Download : Microsoft Internet Information Services