11-part tutorial on learning to program with Ruby.

Rip apart PDFs.

"It’s an interesting exercise to try to envision a 'news app' devoid of any presentation layer. At a site like TPM, your first logical step is to define the basic unit of “news” as a post. Though by doing this, you’re already jumping to presentation. Better to think like a version control system, say Git. Git defines a file’s innards as a 'blob.' It doesn’t know what you’re storing, and it doesn’t care. This “news blob” could then be a post, an email, a breaking news alert text message, an article, an item in a feed reader, even a podcast. When you put an image or a piece of text into Git, they are both blobs."

Introduction to Rails concepts, not a tutorial