Any of us who have looked at dozens of programming books start to notice the differences. One of the first things I do when choosing a book is look at the publisher. So what are our favorite computer book publishers and why? Share your experiences of the books you've read.
Please post only one publisher per answer so they can be voted on separately. :D
also see Is the quality of programming books between publishers noticeably different?
There a many good publishers so going wrong can be hard. But one fact I've rarely seen disputed is that Sam's "teach yourself X in 24 hours" books are terrible.