At Dreamforce 13 I presented three sessions:
- High Reliability DML and Concurrency Design Patterns for Apex
- Apex Design Patterns for Managed Packages
- Design Patterns for Asynchronous Apex
The sample code from my three Dreamforce 13 sessions are all included in a single unmanaged package that you can install using the following link: https://login.salesforce.com/packaging/installPackage.apexp?p0=04ti0000000Xbhb
If you are unable to install the package, you can download the sample code and metadata here.