If you haven't visited it yet, I'd highly recommend taking a look at the new dedicated IIS community site: http://www.iis.net
This site has a ton of content about IIS 6. Checkout the "Downloads" tab for log-parsing utilities, MOM managmenet packs, lockdown tools, and more. The "TechCenter" tab then has an easy interface that you can use to search for whitepapers, KB articles, and web-casts.
Best of all is the content the site has about IIS 7.0 -- which as I've blogged in the past is a major, major improvement to the Microsoft web platform. Read this blog post to learn more about the improvements, and then check out the "IIS 7" tab on the site to read even more. Here are the high-level sections to visit:
Make sure to click on the "Featured Articles" to the right of each of the section pages above for detailed articles and "how to" tutorials that you can run for each topic area.
Try out IIS 7
You can try out IIS7 either by installing the new Windows Vista Beta2 release (now available for download on MSDN), or by visiting: http://virtuallabs.iis.net/
This cool virtual-labs web-site allows you to spend 90 minutes managing a remote IIS7 server in a virtual sandbox environment -- no need to install any beta software locally. It also includes three lab tutorials that you can follow along to build a .NET or C++ core module for the server, check out the new unified configuration system, and use the new diagnostic features to inspect what is happening in the web server. Best of all -- you can use it completely for free.
The new www.iis.net website also now has dedicated forums for IIS questions (for IIS5, IIS6, and IIS7). This is an ideal place for administrators to ask questions about IIS, and for people using the new IIS7 to connect directly with the product team.
Hope this helps,