Evolution of Single Sign On
Several ways I have seen this implemented over the years
Web Architectures
Working with caches and Memcache
When and how to use caching without introducing bugs
Ubuntu on EC2, the simple way.
Running compute-heavy workloads on Amazon's virtual machines
How small websites become big
Guidelines for scaling web applications from small to high-traffic
CDN Optimizations
How extending nginx cache duration improved site performance
Nginx rocks
Serving gigabytes of images with zero restarts for months