Aside from the fantastic centerpiece video, produced by Dan Stein Photography + Imaging, this site features all the goodies you'd expect on a wedding website, along with some great custom features:

• Customized "save-the-date" e-mails with custom greetings and click-tracking
• Customized RSVP management system, so the couple can get the exact information they need from their guests
• Simple guestbook without the bells and whistles you find on generic wedding sites
• Look & feel designed by the couple -- no templates used here!