This is kind of a spin-off from the cast-on thread. Do you have a favorite knitting reference book? The one you go to when you need to figure out a technique mentioned in a pattern, or maybe which type of increase is the best one for your project?
Share your favorite book title here!

I use Montse Stanley's Knitter's Handbook from Reader's Digest. The illustrations and explanations are great. The reason why I got that particular book is that it was the only reference book available at my local bookseller at the time.
I know Interweave Press has out some knitting reference books, as well as Harmony publishing.
And, there rare all of those lovely learn-to-knit books that have just enough to keep you coming back for years if you forget something.

I use Ultimate Knitting book published by Vogue Knitting, but I also keep Knitting Companion in my knitting bag when I travel, much more convenient.

Is KnittingCompanion the flip one with the spiral binding put out by Interweave?

Yes it is, and they have one for tablets like the ipad also.

I like the idea of having one for a portable electronic device, since we take them everywhere so often.
Does anyone else have a favorite reference book? Is anyone using an app or an ebook for this purpose?