Stackless Python (whichI'... (04 May 2002)
Stackless Python (which I'm sure I've mentioned here before) is moving towards a Limbo [1, 2, 3] model of microthreads.
Maybe an interesting book: IA-64 Linux Kernel
Wolfram's book of about 10 years is coming out soon (May 14 so says the website - but that might slip).