W. Richard Stevens has never let me down with any of his books, and this one is no diffrent. Its too bad hes not around to write books any more, alot of people will be missing out on great books from a great author.
This is a must have!!
I've found this book very useful for understanding T/TCP, a subject my teacher did not explain well and was obscure for me.
The NNTP & HTTP cover was useful, especially as I was doing a lab on HTTP, but I must admit that as far as HTTP goes the RFCs were sufficient.