IRC Channel:

 #debian-kernel on irc.debian.org

SVN checkout (anonymous):

 svn co svn://svn.debian.org/svn/kernel/trunk

Developer SVN access:

 svn+ssh://<user>@svn.debian.org/svn/kernel/trunk

Docs:

DebConf5

Kernel packages for various architectures:

Other Kernel related pieces:

Architecture Status

Kernel team members:

There's also a ["Kernel"] page - the difference isn't well defined anywhere.