ReadMore, by Bjoern Giesler, is an Ebook Reader with no frills, bells or whistles. It currently has the following features:

– Book-style format; the DS is held on end like a pocket book.
– Only .txt files supported.
– Anti-aliased fonts, changeable per document.
– Three bookmarks per document.
– Last visited document is re-opened on program start.

http://forum.gbadev.org/viewtopic.php?t=12810