Just have to write a quick note and highly recommend this book from Adaptive Path. The title Subject To Change: Creating Great Products & Services for an Uncertain World is an excellent guide to user centered design as not just a set of principles for making better software but as clear path to thinking of providing services to end users that they are actually wanting and needing. I wont attempt some grand book review hear as there are plenty written by folks much better qualified.. I will merely say if you have any intentions of starting a business or are already a business owner you should read this book. These folks are at the bleeding edge of thinking in new models of business development and I plan to make every effort to attend thier next UX intensive training...
In true web fashion there is also a very well put together keynote talk given by Jesse James Garrett which covers some of the core points from the book. You have to hand it to adaptive path for not only doing this excellent research and development but also for being willing to share their brilliance with the rest of us. Also thanks to scribemedia.org for making this presentation available.