Back in March I
posted about amberjack which allows you to create tours for your site. A couple of days ago Duncan Riley, over on techcrunch, highlighted another service.
Demofuse also allows you to create site tours and has some nice features I didn't see with
Amberjack.
The main advantage of demofuse is it allows you a lot more interaction with the page, highlighting sections, giving tips etc. Where I think it is weak is in moving around the site. This functionality just doesn't seem as smooth as with amberjack.
Beyond the functionality the main difference is that amberjack is a downloadable javascript library licensed under the LGPL and demofuse is a hosted service. There is no mention of a fee for using it but this is something to be aware about.
My personal preference would still be amberjack - I would prefer the control which a downloadable library allows and for my tastes the added functionality which demofuse offers would be better integrated more fully into the design of a site rather than being limited to a site tour. It's a tough call though and I can certainly see situations where demofuse would be the better option.