Photoshop CS5 on demand (book review)

Written by Steve Johnson this is an excellent well laid out reference type book, while not specifically teaching you photoshop it does explain everything very clearly and covers a lot of detail and pretty much everything in CS5 you'll need to know.
This is the sort of book you'll reach for to find out how so and so works, like how the pen tool works or whatever, very very useful reference book.
Would I buy it?, yes pretty much an essential book for the shelf, you won't use it every day (especially if your experienced) but when you do need it it'll be bloody handy.