The MagSafe, USB port, and sound card are all part of one smaller board that connects to the logic board.

There's a blob of glue on the ribbon cable connection points that acts as an insulator. This may prevent some electrifying results from occurring should the contact points wear through the plastic sheeting and touch the aluminum case of the Air.

The Air sports a Cirrus Audio 4206ACNZ audio controller. We saw this same chip we found in the latest MacBook Unibody and Mac Mini