About NTLM/Kerberos and Constrained Delegation in W2k3

I find some well-written documentation on NTLM/Kerberos and Constrained Delegation in W2k3 to share with my colleagues.  They are useful as introduction and reference materials.

NTLM
http://davenport.sourceforge.net/ntlm.html

Kerberos
http://www.microsoft.com/msj/0899/kerberos/kerberos.aspx

Constrained Delegation/Protocol Transition
http://www.microsoft.com/technet/prodtechnol/windowsserver2003/technologies/security/constdel.mspx