Some of the parthers with whom I work are; their pulses race when they start to look at the massive upgrade to IIS6 (my sloppy terminology).
In helping them find resources, I found none better than our own IIS7 site at http://www.iis.net/. The site contains a wealth of information on IIS, including secure hosting, whitepapers, implementing modules (modules are new to IIS in version 7, essentially replacing the use of ISAPI) and a collection of sample code for developers and administrators.
Much of the content has been refreshed quite recently, so if you've been there before, it's time to go again!