I had a night in with time to kill on Friday and so rented Limitless from the video shop. Okay film but a great premise based on the idea that you only currently use 20% of the full capacity of your brain. However, by taking a small clear pill, you can suddenly  make use of all of the power in your head. The 'hero' than starts making money (lots of it in fact) from his ability to process vast amounts of information very, very quickly, certainly faster than his peers. He did deliberate for a while about taking the drug but once he had experienced the phenomenal achievements that were possible just once he was completely hooked. It left me with question:
If you could use all of your brain's capacity, what would you do differently? What sort of things would you start to do that you have never tried before (or maybe attempted but you couldn't adequately get your head round things)? Alternatively, what things would you want to be able to do even faster or more efficiently than currently?
I feel its one of those questions that gets you thinking about what you really want from life, along the lines of, 'If you won the lottery...' yet this one is different. Winning the lottery relies very heavily on luck. That and buying a ticket of course. Having an extra hour in a day relies on bending some serious physical laws of the universe. Miracles taking place might be similarly unbelievable for you.
Using more of your brain though...? Yes, I suspect that we will never fully harness its complete power but could we get more from it? If you watch the power of the subconscious that Derren Brown can put to use, in himself and in others, you realy have to say yes! But even without that, most of us are aware that we could be better in some way that we use our heads.
Maybe its as simple as focussing our brain power on one specific area that we feel is important or interesting to get more from - a simple time management issue. Or thinking more creatively about a current issue. Whatever we think we would like more brain capacity to deal with, we probably already have the untapped potential which suggests something else is stopping us instead. So then the question becomes, 'what is stopping you from achieving what you want to do?'