Don Box writes an emotive plea in favour of WSDL, from the point of view of a programmer in strongly typed languages trying to interface with weakly-typed scripts. [Scripting News]
As nifty as scripting languages are, I'm still of the opinion that strongly typed languages scale better (in terms of development, not runtime) than weakly typed languages. Sure, if your unit test coverage is heavy enough you can compensate, but why write extra tests just to cover something that your compiler can catch if you're using types?
I also liked the line: I quickly found out that C++ programmers are the smartest programmers in the world, as each one I met would quickly point out to me.