I know a few common patterns that seem to bedevil nearly every project at some point in its life cycle:

1. Inability to take outages
2. Third party components locking out upgrades
3. Non uniform environments
4. Lack of monitoring and alerting
5. Missing redundancy
6. Lack of Capacity
7. Poor Change Management
8. Too liberal or tight access policies
9. Organizational changes adversely blur infrastructure ownership

I was hoping there is some well articulated library of these anti-patterns summarized in a book or web site. I am almost positive that many organizations are learning through trial by fire methods. If not let's start one.