dyn!o, i think they need to check source out to see that you are its writer and how many flaws it has. Ideas are basic things. I suppose they want to know if we think or we just copy what we read in other tuts. I agree that most things i seen there should work on all OSs, but for any eventual unpacker contest i think they should allow NT systems only.
And i agree with you that Delphi should be allowed too, at least when program is written without VCL.
I dont think they will get anything important from these contests
At least till now i didnt see they asked for too many things that'd be usefull for strengthening protections. And i think that people who grade those works have enough skill for excellent protector.