Great programming books you read in 2009?
gtani: by categories:(definition of "read, past tense": spent at least 45 minutes in Borders flipping thru)-----------------------FP:-- Cesarini/Thompson, Erlang ; Logan, Merritt, Carlsson, OTP in action-- Halloway, Clojure (supposedly, besides the Manning MEAP PDF book, another Manning and a Apress book are in preparation)-- Scala: (all 3 books look pretty good, tho I haven't spent a lot of time digging in, and haven't decided if scala's language syntax is denser than clojure's; Payne/Wampler text freely available online-- haskell: Real World.  content freely available online.----------------------------NoSQL,  kvstore, docstore,  mapreduce:-- Hadoop: Oreilly (White) and Apress (Venner) look good at first glance-- couchdb: freely avail draft by Anderson, Slater Lehnardt---------------------------------Messaging queues and brokers: AMQP, rabbit, XMPP, ejabberd:- no books / drafts, PDF beta books I'm aware of