3 - New "patch" interface type
8 - Configuration database with remote management
11 - Support for XenServer 5.5 and 5.6
12 - Performance and scalability improvements
21 - Add support for sFlow(R)
22 - Make headers compatible with C++
27 - User-space forwarding engine
32 - Add support for NetFlow active timeouts
41 - Generalize in-band control to more diverse network setups