Just had my MacBook Pro 13″ upgraded to Mac OS X Lion (10.7), and all I can say so far I’m enjoying the new features.
There are over 250 features introduced with OS X Lion, the major of which are detailed in the Apple site. I only got to play with Snow Leopard for a week before Lion was made available, and it was my first Mac experience. So honestly, I may not the best person to tell the differences in features, but let me walk you through the obvious and the most enjoyable for me so far.
Check out the pictures that follow (which by the way was taken using my iPhone 4):