However, this site has loads of useful links, as well as glibc info!Warning
LinuxThreads is now obsolete and is being replaced by NPTL. The initial author of LinuxThreads (Xavier Leroy) stopped working on LinuxThreads a long time ago. The glibc development team, in particular Ulrich Drepper, continued working on LinuxThreads for a while, but are now developing NPLT instead.
More
http://www.akkadia.org/drepper/
Aitch