Kernel Notes
A great Linux portal. You can always find the latest kernels (both stable and development) there.
And check out the FTP watcher and Software Browser for all the latest binaries.
Linux Documentation Project
Quoted: The overall goal of the LDP is to
collaborate in taking care of all of the
issues of Linux documentation, ranging
from online documentation (man pages, HTML,
and so on) to printed manuals covering topics such as
installing, using, and running Linux.
Definitive enough?