Current Protocols: A series of books that strive to be an "authoritative, up-to-date, and comprehensive source for research methods and topical overviews" for the life sciences. Tables of contents and sample chapters available.
Natural History Museum Publishing: Produces a wide range of natural history books and bulletins. Full catalog with online shopping.
Papers in Biomedical Sciences: Full text of original papers from the 19th century onwards that Donald Forsdyke deems critical to the understanding of some major problems in the biomedical sciences.