How to create a sequence of nodes to work as a "tour" through a site?
Custom Pagers 


  Custom Pagers allows administrators to define context-sensitive
  previous/next pagers for any node type. The list of nodes to be cycled
  through is generated by a user-selectable view, and each pager can be
  displayed above or below the node body or in a sidebar block. This
  makes it possible to duplicate the paging functions of forum.module
  and book.module, as well as more complex stuff like comic strip
  navigation. Requires token.module and views.module.


and Nodequeue


  The Nodequeue module allows users to collect nodes in an arbitrarily
  ordered list.