I've recently purchased MacSparky's OmniFocus Field Guide, so that I can master the tool. It's my hope that the tool will allow me to structure my day. I loose track of what is important sometimes and things have a tendency to get lost either through being too busy or just straight procrastination.
When I look back at my life, the times that I'm the best is when I have a structured system. I've got a brain and I can come up with ideas, but it's pointless if I can't remember what commitments that I've made or where I'm going with them.