I've been taking a look at HTML5 today and I want to know what features people are using to make building webapps easier. So, what features are you using and why does that feature make your life easier?
This may seem a bit trite what with things like canvas and webgl but I love the form features.<p><a href="http://diveintohtml5.org/forms.html" rel="nofollow">http://diveintohtml5.org/forms.html</a>