We have mentioned Amberjack long time ago. Amberjack enables webmasters to create cool site tours. By guiding your site visitors, Amberjack tours can greatly improve the usability of your website.
Now they have released Amberjack 2.0, which allows easy creation of On-Page Tutorials. Users can navigate with bubble arrows, keyboard right/left or mouse click left/right. Text bubbles explain page elements to your visitors. You can also use HTML and CSS knowledge to customize the bubbles as you like. Embed a video is also possible.