A new version of "NIST Special Publication 800-41, Revision 1, Guidelines on Firewalls and Firewall Policy" is available, it can be found here ==> http://csrc.nist.gov/publications/nistpubs/800-41-Rev1/sp800-41-rev1.pdf

This is an update to the original document, published in 2002.   If you are required to be compliant with the NIST 800's, either by regulatory compliance or internal policy, this updated document is worth a read.