Hi Alex,
I am developing a new reader for Win Mobile which is free of DRM. It uses rtf files so if you have removed the DRM on your books you can google a converter to convert them to rtf files and use ZuluReader. If you are interested you can download it here
www.zuluexpress.com/software . My site is still very much under construction at the moment as I am concentrating on development of ZuluReader itself.
I am very keen for some people to try it out and give me some feedback.
Cheers,
Steve(ondabeach)