New web features in iOS 5

Excellent overview by David Calhoun, complete with videos and pictures. Apple never mentions these things in the keynotes, but they're usually my favorite parts of the update. My personal favorite this time around:

A point of contention since the original iPhone was released in 2007, position:fixed now works on iOS5! What this means to developers: it’s now very easy to create top and bottom toolbars for your web apps

Fantastic.