Wrong forum, moved to General.
anyway, the manual is 400 pages (printed) thick. I don't think that's pretty small. If you need a reference manual for the runtime libs, that's in the installation folder or available on the website as a .chm file.
The book linked on the website is for 1.0.2005.1, and it's free as pdf if you simply select it from the lulu store and fill in the information like you buy it. You then don't need to pay money as it's free.
The generated code has xml comments generated into it (which takes approx 50% of the generated code's size). You can generate documentation from that using ndoc, sandcastle (from MS) or a commercial tool