>>1
Personally, I think C++ is a wonderful tool, once you managed to understand it. I doo agree with
>>6-san that D has an interesting concept,
HOWEVER I really dislike two things about D:
1. The builtin Garbage Collector
2. There are practically only two usable compilers (dmd and dmd2)
Althoough there is also ldc (D compiler using the LLVM backend), and gdc (D compiler using the GCC backend)
Beside that, you really should ask yourself: What does D do, that C++ can't do? It's obvious that everything you can do in C++, you can do in D, and vice versa. The main difference being, that C++ is an ISO standardized language, is well tested, has a far bigger community, and a far broader choice of implementations (that includes compilers and interpreters).
D still has a loooooooooooooong way to go. A very long way.