Here's a compiled list of the best tutorials, for anyone who wants to learn.
Headhack Tutorial: http://www.facepunch.com/showthread.php?t=534654&highlight=tutorial (http://www.facepunch.com/showthread.php?t=534654&highlight=tutorial)
Porting and Ragdolling Tutorial: http://www.facepunch.com/showthread.php?t=542906&highlight=oblivion (http://www.facepunch.com/showthread.php?t=542906&highlight=oblivion)