I like to visit the website Codrops (from tympanus.net) from time to time to view their tutorial/demos.  They always have cool cutting edge HTML5 / jQuery stuff, with lots of creative ideas.  I thought, while browsing their site, that I’d list a couple of my favorites.

• http://tympanus.net/Tutorials/BigVideoSlideshow/ – cool fullscreen video slideshow as website background
• http://tympanus.net/Development/CassettePlayer/ – Old School Cassette Player with HTML5 Audio