In early 2007 DataViz released Documents To Go for WM Smartphone (non-touch screen devices which was essential since these devices were unable to create documents at the time. Today, DataViz announced their new Windows Mobile touch screen product so that they now have the application for many mobile operating systems (except for the iPhone and S60 platforms). I personally use the native Office mobile products on most of my Windows Mobile devices, but I do like to use the full SoftMaker Office on the HTC Advantage so I can see where this full featured application from DataViz can serve well for many people in enterprise applications.
DataViz includes a native PDF viewer, password protected support for Word and Excel and their excellent InTact technology for successful format retention. They are also going to release a version optimized for high resolution displays like those seen on the HTC Touch Diamond and Touch Pro. It is also very reasonably priced at US$29.99.