Guided Help is not only a Windows Vista product, it's also being used by Microsoft's support website to help people complete the steps in a kb article.  We no longer tell folks to whip out regedit and check a registry key or search their harddrive for a particular file.
 
Check it out!  To get an idea of what downloading and using Guided Help on XP is like, check out this link which has a screenshot walkthrough.  But better yet, check out the list of Guided Help topics in the pilot.  You can clearly distinguish when a guided help topic is available.
 
A word of warning - it will really do it!  That's sort of the point.  So don't run one about formatting your harddrive if you don't want it done :).  This one is really safe, though, if you just want to try it out.
 
Enjoy! (the team is accepting feedback at acwfeed @microsoft.com)
James