iPhone OS 4.0 First Look: It's Slick, Fast and Multitasking Is Great

A tipster has been playing around with the iPhone 4.0 OS beta, and sent us the following report and screenshots.

iPhone OS 4  is slick and fast. It feels pretty polished even though it's beta. There's a few glitches here and there but no showstoppers. It does not appear to work with all apps. Some apps do not [...:]