This site for Sonia Rykiel's AW2013 collection has a great synergy of content and design. The way the colour changes for each look works really well. On a technical note, it uses YouTube to host the video content, so this is a fine example of how to use their video APIs.
In preparation for the new Lars von Trier film 'Nymphomaniac', a site has been produced which will release teaser clips leading up to the film's release. The transitions as you scroll down and the overall design and tone work nicely. Surprisingly not NSFW.