Interesting discussion. I would say a tool is an aid to solve a problem, whilst a toy provides its own justification for use. For instance, if you buy an iPhone because you want one, then come up with ways to use it afterwards, it's basically just a toy. However, if you're always on the move and need to be able to make phone calls, do your email and retrieve information from the Web whilst you're travelling, the iPhone may well be an efficient tool.

I think almost anything whose use could be seen as enjoyable can end up alternating between being a tool and a toy. At certain regular times each day, our kitchen is basically a family fuel distribution centre, but come the weekend it may well end up as a playground instead. Similar distinctions can be made for my PC, my car, my bike and so on. If you're using something for the pleasure of using it, it's a toy. If you're using it to help you achieve a necessary end, it's a tool.

IMHO, of course.....