Yesterday, Adobe has released AIR 2.0 runtime and can be downloaded at get.adobe.com/air/.
The new things in AIR 2.0 are:
New Webkit with additional HTML5 and CSS3 support
Multitouch and gestures
Enhanced drag-and-drop support
Enhanced socket support
Enhanced printer interaction
DNS resolution
Local microphone API
Native document handlers to open document
Native process APIs
Native installer
Socket servers and peer-to-peer networking
TLS/SSL sockets
UDP networking support
Global error handler
IPv6 network [...]