Few can possibly deny that simplicity rules the internet. The most popular websites for particular categories are, invariably simplistic and clean. Craigslist, Facebook (which overtook the cluttered MySpace), Twitter (which I think is more popular than Facebook), and Google are all examples of this principal in action.
In fact the entire Web 2.0 revolution and look is built on simplicity. Less form fields and buttons, ajax, and fewer clicks all feed this school of thought.