Some bullets for gearheads:
- HTML5’s HEADER, FOOTER, NAV, and SECTION elements. They even work in IE, thanks to the createElement trick.
- CSS3’s opacity, text-shadow, background-size, and RGBA backgrounds.
- bonus: -webkit-transition for some subtle animations
- ASP.net v3.5 for master pages and HTTP compression
I’ve been using CSS3 for a long time, but this was the the first with HTML5. The design is based on existing print materials. It’s just a brochure site, but it was fun.