You've heard that Facebook switched from HTML 5 to "native" apps on iOS and Android recently to "speed them up." That pissed off the developers from Sencha http://www.sencha.com/
So they built a Facebook app completely in HTML 5 that's even faster than the native Android and iOS apps that Facebook released.
Sencha builds HTML 5 programming tools and the video discuss the market for app developers and the choices they have to make.
I've high hopes for HTML 5! A little caveat though - this is a promo for Sencha. But still...
If they can make an HTML 5 web app that is/can be faster than native apps, then why can't we? Practice time!