Yes, there is some D-specific support (which I have presented at the recent D Programming Language Conference).
Unfortunately the debugger can only be as good as the debug information generated by the compiler, and DMD currently has some challenges in this area. Line number info for example is a bit flaky. There are some other issues too, and I am working through them with Walter Bright, as much as our time allows it.
I have refrained for widely advertising D language support, as the feature is still work in progress / experimental (well, the entire project is work in progress, but some features are less stabler than others).
Best,
Cristian