Oreilly And Associates

Publisher of AnimalBooks, as well as other really great series, such as

Annoyances
CD Bookshelves - Most, if not all, O'Reilly books on a subject on one handy set of CDs. But IsAnythingBetterThanPaper?
CookbookSeries (AnimalBook)
Developer's Notebooks
Hacks - Or how to tweak your tools to get the most use out of 'em.
Head First
In A Nutshell (AnimalBook)
Missing Manuals
Pocket References (AnimalBook)
Personal Trainer
Technology & Society
NinetySevenThingsEveryProgrammerShouldKnow