I find most of my reading material on the Usenet. Places like forum.nox.to, ebook-land.cc or even ibooks.to are the backup sites I turn to when I can't locate something. Yeah, downloading from OCH may not be very convenient, but for small ebook files it's acceptable. If there's a torrent tracker like MyAnonamouse for German language ebooks I don't know of it, whereas the online libraries that have been mentioned (Anna's Place, Zlib)j only offer a small fragment.