Oliver Nassar

One of the best article's I've read in the past month is entitled Heuristics for User Interface Design

In short, it's a set of suggestions rather than rules, that should be kept in mind when designing a user interface or experience. I'm tending to lean away from the word interface, as an interface is only good if it's experience is effective. Gmail's experience is what affects me, it's interface is just what I look at rather than what I use.