P-base is a database of several thousand sound patterns in 500+ languages, which I used in my dissertation to argue for emergent feature theory, which is intended to account for the prevalence of phonetically natural classes, something which innate distinctive features have also been used to account for.
Jeff Mielke (2008) The Emergence of Distinctive Features. Oxford: Oxford University Press.
Jeff Mielke (2004) Moving beyond innate features: a unified account of natural and unnatural classes. NELS 35, University of Connecticut.
Jeff Mielke (2007) Unnatural classes and the class-pattern connection (MOT 2007) Jeff Mielke (2005) Ambivalence and ambiguity in laterals and nasals. Phonology 22.2: 169-203.