This past November I participated in the PragProWriMo. For those familiar with the NaNoWriMo, the concept is similar. Commit to writing on a technical book every single day for the entire month of November.
I had been kicking around the idea of writing a book on Node.js and decided to use this as an opportunity to see what I had to say on the topic. Turns out that I had about a hundred and fifty pages worth of material.