I own both the 7th and 8th edition of the Red Book, and can only recommend not to waste money on it. The online resources linked to above are free and much better.
The "Red Books" are the best "learning OpenGL" books you can buy, but only because there are only 2 or 3 books alltogether, and the other ones are still worse. Sadly. I wouldn't mind paying $$$ for a good book.
In their defense, the 8th edition (OpenGL 4.3) is not as abysmal as the 7th edition, which despite its name does not at all refer to "OpenGL versions 3.0 and 3.1", but is rather an "OpenGL 1.x" book that had a few words added on some new 3.0/3.1 features -- but without any diligence onto the modern programming models or deprecation, and with hardly a way for the reader to figure it out (if you don't know already, you're lost). At least this has been fixed in the 8th edition, this edition really addresses OpenGL 4.x as promised.
The books are full with errors (spelling, logic, subtle, and not so subtle ones) which gives the impression the authors didn't even bother to proof read (they probably did, but it doesn't look the like). I stopped counting after scanning over the first 20-30 pages.
The code samples are in "C with some C++" or whatever the authors call it, and I sometimes find them needlessly obscure in some places, but alas... that may as well be a matter of taste.
Still, I find the online resources such as the one by Arcsynthesis more comprehensive, more useful, and well... they're even free.