Just stumbled upon What every programmer should know about memory:

1. Part 1 (Introduction)
2. Part 2 (CPU Caches)
3. Part 3 (Virtual memory)
4. Part 4 (NUMA systems)
5. Part 5 (Cache optimization)
6. Part 6 (Threaded optimizations)
7. Part 7 (Memory performance tools)
8. Part 8 (Future technologies)
9. Part 9 (Appendices and bibliography)