"A cool tool is anything useful that increases learning, empowers individuals, does work that matters, is either the best or the cheapest or the only thing that works."
This is a the book form of what this thread intended to be. I bought two with the intentions of gifting one. Now that I had a chance to look through it, it will probably be my default item to buy for a gift on any occasion.
I found Amazon to be cheaper than Chapters.
http://www.amazon.ca/gp/aw/d/1940689...rCL&ref=plSrch