Kathy Sierra of Creating Passionate Users has a great new post where she illustrates how great product design makes it easy for the user to do the right thing and difficult for them to do the wrong thing.
Simple principle, but difficult to always practice. For example, we know we have some usability issues on the Resurrection web site. We need to make some improvements to make it really great for users, but we can’t do it all immediately. Is the first step admitting you have a problem?
Clif Guy sporadically 
It took us over 2 years to revamp our website (launched in July). We knew the site needed serious help, but there were many MANY internal things that needed fixing before work on the site could even begin.