Adam Kalsey takes the California State Fair webmaster to school, covering every bug, display problem, and user experience issue during the process. The level of detail is great, I often find myself stuck in similar forms and situations but can never muster the energy to write down everything that is wrong with the site.
These exercises are useful for every developer and designer working on similar sites. This critque, combined with sites like Design Not Found are loaded with lessons on what not to do. Those that don’t learn from mistakes are destined to repeat them.