I checked up on the many available OpenGL books before purchasing this. I wanted to do my OpenGL in Delphi and there's, obviously, a dearth of books for OpenGL with this language. However, don't let that daunt you - I have found that this book is very helpful in explaining concepts and getting you to understand "what" you're doing and "why" in OpenGL - the "how" will be ever so slightly different in a language that is not C++, but you'll have the hand-holding the book provides to get you through it... after all, OpenGL is a standard and the actual OpenGL bits are the same in any language.
The first chapter is a bit of waste - going on about why people program things like games, and setting up your window (totally Windows C++) to show your first OpenGL scene... I have found the following chapters very enlightening though... the explanation of states and primitives is good, likewise the chapeter on perspective and orthographic projections was helpful to me... camera movement too. Transformations was already in my head and likewise textures and displaying of text. I'm only using quick and dirty default lighting in OpenGL at the moment so I look forward to the chapter on lighting and also fog. All in all - a good enough buy for me to get value out of it.