If you aren’t interested in the $1000 Apple Thunderbolt display but still want to add some speedy data transfer to your new MacBook Air, Sonnet has a pretty good solution.  Shipping in October, Sonnet’s Echo ExpressCard/34 Thunderbolt Adapter
[ECHO-E34] will set you back $150 but give you access via ExpressCard to the faster data transfers including eSATA, USB 3, Firewire 800, Gig Ethernet or even speedier access to SDXC and CF cards.

There will be more of these “Thunderbolt docks” coming before the holidays.