An online test drive (and mini-tutorial) for MapPoint is available here:
Microsoft MapPoint Test Drive
This uses the Citrix Browser Plug-in which was a little slow to get started with my wireless "Broadband" connection (Sprint EVDO), but with a little patience it did finally load. The registration is quick and painless. But doing Citrix (like WebEx or VNC) stuff with graphics and maps over the internet with EVDO is just too slow. I'd recommend to check this out when you are on a faster broadband connection.
A Flash tour is available here:
This is straightforward, again it does take a little while to load on a slow connection but once it does it is easy to view and navigate without any lag. It is slick and quickly shows many things that can be visualized and lots of things you can do with MapPoint. (But I'd recommend to turn off the sound :- ).