I've written a program for reading eBooks on Windows Mobile devices. It can read txt, html and (DRM-free) ePub files. Screenshots attached.
The program is called 'Freda' - short for 'free reader', since it is free software (both in the sense of 'free beer', as I am not charging for it, and in the sense of 'free speech', as I am licensing my code under the GPL).
It's in 'public beta' at the moment, so please
download it and let me have any feeback.
The program uses two third-party libraries, SharpZipLib and the Majestic-12 HTMLParser library; both are licensed on terms permitting their redistribution for commercial and non-commercial purposes. More information is
here
Happy reading!