Karl Seguin released his Foundations of Programming eBook, bundling a series of great blogposts on different topics:

- ALT.NET
- Domain Driven Design
- Persistence
- Dependency Injection
- Unit Testing
- Object Relational Mappers
- Back To Basics: Memory
- Back To Basics: Exceptions
- Back To Basics: Proxy This and Proxy That

I personally enjoyed his style very much, and I recommend this eBook to anyone serious about programming. Even for more experienced developers than myself it will be an interesting read.