One of my favorite quotes, from Lee Unkrich of Pixar: "We don’t ever finish a film, I could keep on making it better. We’re just forced to release it." http://m.wired.com/magazine/2010/05/process_pixar/all/1

Pixar is such an inspiring company when it comes to creativity, innovation, and values. If you've never seen the excellent documentary "The Pixar Story", I highly recommend it.