DataViz have released a new version of DocumentsToGo for Windows Mobile with support for viewing Office 2007 files (.docx, .xlsx, .pptx etc). This is great, I have not used DocumentsToGo since my Sony-Ericsson p910i days but instead relied on the Office Mobile suite embedded in Windows Moblie 5.
The current version only supports viewing of Office 2007 documents as of today, but if you purchase the application you will get free upgrades and the coming versions will support creation and editing of Office 2007 documents.
The upgrade to Windows Mobile 6 does not support the Office Open XML format which I originally hoped for but now DocumentsToGo has come to rescue…