Upgrading to Lion from Snow Leopard

AirDrop, iCloud, multitouch gestures...

You will want more memory. 2 GB is the specified minimum but 4 GB is considered a practical minimum.

• Do you use iOS? You’ll feel right at home
• AirDrop
• QuickTime is now more of a movie editor
• It’s rock-solid
• HD Video Chatting
• FileVault now encrypts external drives
• iChat and Mail updates
• Full screen apps
• New gestures
• iCloud

Airdrop is an easy way to transfer files between multiple macs. You can drag and drop the files between computers. Though the Macbook Pros don't have touch screen, they do have touchpad. You can use multi touch on the touchpad, like two/three finger swipe, pinch to zoom etc