Manning Publications is, IMHO, by far the most professional publisher when talking about technical books. They don’t publish books for every possible technology – I wonder who’s buying books for OpenNI or Yii. They carefully select the topics and all their books are of the highest quality, compact, easy to ready, without “noise”. But the best of all is that every December they’re giving away free books. This year’s countdown to 2013 has already started with plenty of offers and some guys have already claimed their free books.