Amberjack – Open Source Site Tour Creator
http://www.amberjack.org/

Amberjack is a lightweight Open Source library, enabling webmasters to create cool site tours. By guiding your site visitors, Amberjack tours can greatly improve the usability of your website. The Amberjack JavaScript library is lightweight (~4K), stable, LGPL licensed, browser compatible, set up in 2 minutes & super-easy to customize. Best of all, nothing must be installed or learned. Use the Tour Wizard to create great looking and helpful tours for your site or intranet application. This has been added to World Wide Web Reference Subject Tracer™ Information Blog.