Tulip Reader

Tulip Reader is a free e-book reader specially designed for PDB(Haodoo, PalmDoc, zTXT Mode 1), TXT and UMD formats.
Lots of chinese books (Tao.pdb) are supported in the reader. And many of free fiction ebook can be found in manybooks, web-books, gutenburg.

Its admob enabled with lowest freq, dont worry about that.