Perhaps even more than advanced features like GPS, camera access, contacts, and
App stores, the lack of viewport-aware position:fixed is what drives
many apps to be developed as a native experience.

Joe Hewitt who brought us
Firebug and the Facebook iPhone app has
released Scrollability, a
single script with no external dependencies that allows developers to
achieve near-native feeling scrolling, just by adding a few CSS classes
to their markup. In just a few hours of its release, the project has over 250 watchers on GitHub.

Joe includes a simple demo for iOS devices that demonstrates super smooth scrolling as well as fixed header and footer elements.

Screencap

[Source on GitHub]