Initializr is an HTML5 templates generator to help you getting started with a new project based on HTML5 Boilerplate. It generates for you a clean customizable template with just what you need to start!

"I'm making some big shifts in my work in the coming months (read: focusing my energies rather than what's become the scattershot of freelance writing). I'm thrilled to say that this will mean more time for Hack Education, thanks in no small part to a research and writing project I'll be undertaking for Mozilla.

It's part of the organization's larger learning and literacy efforts, and my piece will involve researching practices and pedagogies and interviewing teachers, learners, technologists about tools for teaching programming for the Web. Specifically (or rather, conceptually), I'm asking the question: Do we need a "'Scratch' for HTML5?" All my findings and conversations will be written up here on this blog."

Look up HTML5, CSS3, etc features, know if they are ready for use, and if so find out how you should use them – with polyfills, fallbacks or as they are.

HTML KickStart is an ultra–lean set of HTML5, CSS, and jQuery (javascript) files, layouts, and elements designed to give you a headstart and save you 10's of hours on your next web project.

“No Flickr, you have it wrong. I don’t need to install anything. I just need to use a different site to host my video which properly supports modern web technologies.”

The Mozilla hacks blog has details on an awesome web-based guitar tab player experiment from developer Greg Jopa. Using Mozilla’s experimental Audio Data API and the Vexflow HTML5 music notation rendering API, Jopa’s guitar tab player displays interactive sheet music that traces the notes of a song as it plays.

Interactive video built in HTML5 and featuring music from Arcade Fire.

From Apple’s point of view, iPhone OS and web technologies share equal footing. When you visit their developer site, the Safari Dev Center is prominently displayed. The iPhone gets all the press, but when you click on Safari Dev Center, there’s a ton of great information that explains how to use HTML, CSS, and JavaScript on an iPhone.