Shawn Blanc has put together a great chart showing what Apple device he prefers for different tasks throughout his day:

Looking at how regularly I reach for my laptop, and how well it handles nearly everything I do all day, it would seem as if my iPad were simply a luxury. Quantitatively, yes. But qualitatively, it’s a different story. Because the scope and feature checklist of the iPad (and iPhone) alone do not accurately convey the value added.

Perhaps a more accurate comparison of devices and tasks would not be based on tasks at all, but rather on context and use-case scenarios. My laptop is what I use at my desk. The iPad is usually with me when I’m on the go or in the living room. One device is not relegated to one type of task. All are for work and, and all are for leisure — the quantity and quality depends mostly on the context.