Been going over some of the stuff on 24ways, the HTML geek advent calendar, and learning a bunch as I go. Some of the highlights to me so far are:

• Some of the sweet new form input elements and attributes that HTML5 has, such as the placeholder attribute, the required type, etc
• The :last-of-type and :not CSS pseudo-classes! I’ve seen the latter before, but never grokked it. That’s useful.
• But, even cooler is doing counters in CSS, with counter() and counter-increment on a :before or :after selector
• I’ve known about but somehow never played with local storage using the in-browser database. And now I see that safari (and chrome’s) web inspectors have a Database tab! How’d I miss that?