The Postmodern Bible Commentary site appears to be a unique and exciting endeavor. The project's goal is a commentary site covering the whole bible, done in hypertext format. The aim is to explain the Bible in a way that a printed book cannot. The current book available is Amos, launched March 10th of this year.
The site includes Bible text, commentary, Hebrew words, and multimedia resources such as sound for word pronunciation, for example "apophthegma". You can even choose to have the text read to you in Hebrew or English!
The general page layout is in four panes -- menu, Bible text, commentary, and Hebrew word explanations.