When you say that your markup is HTML5, do you just mean that you changed the doctype at the top (That's trivial, and its only real effect is saving a few bytes, though I suppose it's a nice symbolic gesture), or that you are now using all of the new semantic elements like <article> and <section> and <footer>, using <video> instead of plugin-based video, including features like drag-and-drop, or offline use of data-heavy apps, &c. &c.?
