These have been on their site for some time, but I still think they're pretty well done. Unlike video demos that seem to never go at the pace I want, or downloadable demo versions that require installation, AltiGen's interactive flash demos are lightweight, easy to use, and do a pretty good job giving you an idea of what the system is like.
The AltiAgent interface interactive demo is one of the more robust. Be sure to click the config button and run through the tabs.