"Javascript getters and setters may be one of the most useful upcoming language features today (already working in some browsers, including Firefox), but google the feature and you will be swamped with articles and posts, not on how to put them to good use, but how to defend against malicious use of them for web pages tripping (Firefox / ditto extension) security holes. It's really just John Resig that stands out of the crowd, showing how it is done, suggesting good uses, and teaching the stuff..."