I guess if could be possible to see a c++ client lib to use with airplaysdk on mobile and watever other platform that support c++.
Airplay just implement a good multiplatform socket layer.
It can be usefull also for today and tomorrow portable consoles(es. airplaysdk exist on consoles too).
I have seen that your client lib isn't open source that is a bit disappointing because it denies third party developer run their client libs.This stops only people to use it freely but i don't think it stops cheaters and/or preserve your hard against decompilation from quite experienced people.
An opensource lib in whatever language is really needed es a precompiled c++ one cannot be compiled against different architechtures(many mobiles use arm processors).
I'm waiting c# client lib too.It can be used with unity3d, silverlight, windows phone 7 and xna on pc and xbox live.
Probably you will release it as .net dll and not source but it is just something.
I'm not against flash but world is moving on ...lot of solution are coming on browsers and mobiles.
Solution from big brands as google with its chrome native code sandbox or instant standards as html 5.
It's also well know that flash will be always so mutch slower compared to native code and optimized .net or java bytecode too mutch slower on many present and actual devices with processors under 1 ghz and limited ram.