For cultural information about tropical orchids I like two books in particular, the Orchid Species Culture series by Charles and Margaret Baker; and the Encyclopedia of Cultivated Orchids by Alex Hawkes. In terms of style, these two books could not be more different.
At the other end of the spectrum is Alex Hawkes classic 1965 Encyclopedia of Cultivated Orchids. Taxonomy may have changed, but Hawkes' cultural recommendations remain sound. For an encyclopedia, this book projects a surprisingly distinctive personality. I like Hawkes' aristocratic stock phrases, "requires quantities of fertilizing materials, and "is singularly intolerant of stale conditions at the roots." The book's line drawings are exquisite. This book has been in and out of print for decades. After a long search (in pre-internet days) I finally stumbled upon a copy at Fairchild Tropical Garden's bookstore and unhesitatingly forked over all of my cash for it.
Finally, Henry Oakeley's sumptuous Lycaste, Ida and Anguloa, published in 2008. Every plant deserves the lavish devotional treatment that the author gives to these three particularly lovely orchid genera. Oakeley is the National Plant Collection holder for these genera in the United Kingdom and his book is the fruit of decades of work with them. The photography alone would make this a stunning coffee table book. But more than that, it contains descriptions of 150 species and natural hybrids, with photographs, historical notes, synonyms, bibliography, cultural information, habitat details, and information on everything from location of type specimens, pollination mechanisms and how to prepare specimens for exhibition. I suspect it will become a treasured collector's item years from now. I'll leave it to others to debate the taxonomy--this is the book that I would run through the flames for.
Mike and Sarah's Go-to orchid books are here.