I also wondered if the above mapping applet can be modded to allow users to click on each node to launch the relevant page ... hover to see its contents etc
[div align=\"right\"][a href=\"index.php?act=findpost&pid=131556\"][{POST_SNAPBACK}][/a][/div]
I did quite a bit of work with hypertree in my previous job, and yes, you can have text associated with each node that brings up more information below including a link to another page.
Hypertree is powered by XML, the version for download includes the xml libraries, but they are buggy, so download the latest versions and it fixes things.