If you have a microsoft ebook, you can translate it to txt. If there is any interest really soon (like in the next day) I could attach the converter or a link here, as the site may be down.
Funny microsoft, if you have the ebook, chances are you bought it, or will buy some in the future. But they lock it up with drm for their windows (CE) enabled devices and the like.
Their is the mpgp which allows mp3s in the backround during txt ebooks, different fonts and even a nice backround you can change. should be archived on www.gp32spain.com under utilidads.
Even the k2yaa reader on www.gp32eu.com is pretty nice, quick loading and bookmarks!
mth411