A Small List of Best Practices for Sysadmins and Programmers

I present you with my small list of best practices that I have used in the past as reference material and guidelines for work I have done.  I hope that by sharing this it will inspire you to share your favorites, or even create your own best practices documents to help move the practice of system administration and programming forward.

Programming

Web

DNS

Active Directory

Infosec

Thanks for reading.  I look forward to hearing what your best practices are.  Are they hard-won lessons learned on the job?  Industry standards?  Personal preferences?