Something that could really come in handy for those involved in setting up PCs.  I was working on a laptop here and noticed the list of Windows Components on the Add/Remove Components menu was missing every component except the basic networking ones.  I was looking in particular for IIS, as I need to install it for some ASP.NET work.

Sure enough, there’s a ‘config’ file that controls which options are available in the Add/Remove window.  See the file c:\windows\inf\sysoc.inf (note that ‘inf’ is a hidden Windows folder).  Credit to this forum post.