With OSX Lion, Apple continues to focus on refining the finder through the use of multi-touch gestures and improving usability of the OS with some very nice file and folder manipulation improvements. On top of that when you look at both iCal and Address Book you can see how they are taking what they have learned from their iOS cousins to improve the look and feel of the interface plus add some new features and frankly sorely missing on the Apple side of the world.
For instance why are we just seeing Social Media integration into the Address Book? While iCal has some new views the interface to enter new appoints still is just clumsy to say the least. Please take a look at the screencast included with this post to learn more about these items and more.