Freeplane for Windows Mobile
From Freeplane - free mind mapping and knowledge management software
A "light" version of Freeplane called Freeplane for Windows Mobile is available for Pocket PC running under Windows Mobile OS.
This version is really nice to read a Freeplane mind map on your Windows Mobile device and allows you to make some basic changes to the map.
Yet Freeplane for Windows Mobile is available in english only.
The Windows Mobile version of Freeplane can be downloaded here.