Patterns
This page discussed some of more interesting patterns that I found during the years of my practice. These are sometimes well-known, but not widely discussed, and sometimes they are just well-understood concepts, but I feel they are interesting enough for a discussion.
Physical Boundary Around Logical Separation of Concerns
This one is somewhat well known. In fact this comes from the Domain-Driven Design (DDD) principles. While the idea itself is sound, it is not always clear where and how to apply this.