I used D 1.x for doing games and demos, some of them are public domain open source (A, B, C, D, E).
D can give you productivity unheard of in C++-land if you are willing to pay the high-price of arguing with everyone about why do you use D.
If you go this route, i advise you to pick D 2.x, Derelict and Visual D (hint for future readers: this is 2011).
As for game development :
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the D GC is not a real problem. It is if you allocate too much in a frame, but that’s about it. The classic methods of pooling, reusing, etc… work.
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you can write x86 assembly portably across Linux, Mac & Windows. Also static if allows pretty fun templated naked assembly functions.
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inlining across module boundaries is working without a “link time optimization” switch
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I find it easier to maintain debug and release version (compared to C++)
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avoid new features and choose compilers conservatively… just like in C++