BizTalk Best Practices

I'm working on a document which will eventually be published here on best practices for BizTalk development.  What practices do you insist on in your project?

• Naming?  I generally use Scott Colestock's guidelines for this.
• Backdoor Receive Locations? Any rules on putting in re-entry points for non-file adapters?
• Mapping?  Any rules about how things will be organized, laid-out, etc?
• Anything else?

Post your comments here, I'd love to hear people's ideas on this subject.