Whoa. Adobe released AIR B3 and Flex 3 B3 last night. I won't have time to look at the goodies until the weekend but this is great news. Adobe also released AMF3 spec (Flash binary wire format) and reference implementation called BlazeDS.
I wrote my own AMF3 library in Java while back and there are at least two public implementation of AMF3 library so BlazeDS is not a big news but the spec will be useful to see if I missed anything in my implementation. But revealing the details of AMF won't make a major impact because 1) it was mostly known already and 2) it's not the wire format but the format of proprietary contents flowing over the wire that is keeping third party Flash servers back.