If you've been using or demoing Guided Help on Vista's Beta and RC builds, you will probably have noticed that it's not appearing in help search results on RTM.  Here's what's going on:

Executive Summary: It'll be back again in January (in time for the broad release) on the Online Help. 

More detail: Guided Help has moved to be available through the Online Help, instead of shipping on the box.  That gives us flexibility in servicing Guided Help content later, if the UI changes.  The Windows Help authoring team always makes sure that help content is accurate and up-to-date, but Guided Help content is more sensitive than other Help to little UI changes that can happen like service packs or updates.  So it's smart to keep it online, where we can continuously update it.  

How do you get online help?  Easy: the first time you click Start -> Help, it'll ask if you want to get the most up-to-date content from online.  Of course you'll say yes.  What's that, you said no?  Then whenever you do a search in the help pane, there's a little bar at the top inviting you to opt in to the most up-to-date content online. Oh don't want to have to do a search first?  Then at the bottom of the help pane is a dropdown to switch between Online and Offline content.  Guided Help (and all the other continuously published and updated content) lives online - you probably already were getting online content without realizing it.

I still want to demo Guided Help: If you're working at Microsoft and reading this, and you want to demo Guided Help, we have made Guided Help content available to install locally on your demo machines.  This content should not be distributed - everyone will get Guided Help online soon enough, and this content is just to keep let you keep demoing for the next couple of months.

You can go to \\broomcloset\public\ACW\demofiles [Microsoft internal link, won't work outside Microsoft] and this contains simple instructions for installing it.  If you don't have access to that, then Guided Help will be back in January.  In the meantime, you can show off these videos:

http://blogs.technet.com/james/archive/2006/09/20/457713.aspx

http://www.istartedsomething.com/uploads/guidedhelp.mov