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.
If you only need a simple previous/next pager for a specific content type, check out Flippy.