I'd like to add that maybe one doesn't need to be obsessed with inventing something new or fulfilling an unmet need.
Sometimes you can just copy and do better. For ref: http://www.reddit.com/r/Entrepreneur/comments/2d51zq/why_do_...
Great book about beginning with 'inspiration': http://www.amazon.com/Copycats-Smart-Companies-Imitation-Str...