Head first design pattern a must have!

Head first design pattern is a great book to start your learning with on Design patterns. Because the way they present a particular pattern is what makes it a unique book and a must have for every developer, although the code examples is written in Java but anyone working in any language what so ever can have benefit from it. I'll be posting my learning on each design pattern from the book but they are not in any case an alternate to the material presented in the book because It's much more elaborated in the book then the ones I'll be presenting here.