D

What does /prog/ think of it? I've been using C++ for the last three years and some of D's features sound cool, so I might consider switching.
What's D's performance in relation to C++?
Does it standard library not suck? (In particular, I'm interested in structures such as strings, vectors, lists, queues, etc.)
Are there good IDEs available?

>>2
What are you saying? D is a niche language at best - more like a toy language only nerds care about - which hardly anyone knows about, let alone talks about.
In a few years it will be just as dead as it is now.