The Saddest Shelf In The Library
Fuck that! "Philip and Alex's Guide To Web Publishing" changed my life. You can read it here, though it's been heavily revised since the original (per Philip Greenpun's very practical philosophy of what a book should be), so anyone with a library this cool should check out a copy (and then somehow transport yourself to 1998, if at all possible, for context).
In all seriousness, Greenspun set a bar and a vision for long-form web writing that has been sadly marginalized. There's something very touching, 13 years on, about the "Philip and Alex's" chapters in which he argues for the web as an accessible form of education. This is a book that can remind those of us writing online what the hell we're working toward.