Design adds value faster than it adds cost.

Watching nonprogrammers trying to run software companies is like watching someone who doesn’t know how to surf trying to surf. Even if he has great advisers standing on the shore telling him what to do, he still falls off the board again and again.

Shipping is a feature. A really important feature. Your product must have it.

A user interface is well-designed when the program behaves exactly how the user thought it would.

Beware of Methodologies. They are a great way to bring everyone up to a dismal, but passable, level of performance, but at the same time, they are aggravating to more talented people who chafe at the restrictions that are placed on them.

I've been using Vista on my home laptop since it shipped, and can say with some conviction that nobody should be using it as their primary operating system - it simply has no redeeming merits to overcome the compatibility headaches it causes.

Something is usable if it behaves exactly as expected.