On TED.com’s blog we can read:

“Since TED.com launched in 2006, we’ve always aimed to make TEDTalks work across a wide variety of platforms. Anywhere people watch video, we want them to watch TEDTalks.

In the past year, smartphones have emerged as a major platform for watching video and web content. And while TEDTalks have always been viewable on the phone itself (via our iTunes podcast or independently created iPhone, Windows Mobile and Android apps), we saw a demand to view our website through the phone browser.

For this reason, we’re thrilled to announce that TED.com now supports the HTML5 open standard and the H.264 codec. What it means for you: if you own an iPod Touch, iPhone, iPad — or any smartphone that supports the open HTML5 standard…”

More here: TED.com now Available in HTML5