It's basically a system designed by a guy called David Allen. It's a methodology where you define and file absolutely everything that passes your desk, from the simplest text message to your lifelong dream to travel the world. It's all common sense when you read the back, but my brain is feeling remarkably clear since I started implementing some of his ideas. And incredibly, my productively at work has gone through the roof.
However, change is hard, so I'll have to see where I sit in 3 or 4 weeks...