This is a reference definitely worth bookmarking.  The IIS team released an impressive IIS 7 reference a couple nights ago.  You can find it here: http://www.iis.net/configreference.  You can take every IIS configuration item, click on it on the side and be provided with detailed information written directly from the IIS team.  Robert McMurray has worked hard to survey the product team directly to obtain a wealth of detailed information about every configuration setting, and Pete Harris and others have been hard at work helping make this happen.  This was a much need enhancement to a great system.

According to the IIS Blog

This IIS7 Technical Reference provides a list of all the built-in IIS7 features, alphabetized for quick access.  If you know the configuration name you are interested in, just type it into the URL…for example if you’re looking for information on the system.webServer <caching> setting, type: http://www.iis.net/ConfigReference/system.webServer/caching and whoila, you now have a complete set of reference material on the subject.  Literally hundreds of pages of documentation are now freely available at http://www.iis.net/ConfigReference/ and super easy to access. 

Each topic has a quick summary of what the feature is, how to install the feature as well as a quick “how-to” article (with pictures) on locating and using the feature inside IIS Manager.  Each feature is carefully documented with comprehensive information on the configuration section behind each feature including information on each attribute, it’s type and default value as well as sample configuration.  And perhaps best of all, every topic also has sample code for how to use the feature from AppCmd.exe, C#, VB.NET, JavaScript and VBScript!  No more scavenging the forums or live search for sample code!