This looks very good. I'd suggest calling them std.units and std.units.si, if possible. It seems to support all the features I wanted when I started writing such a module, though I never finished mine. The documentation is very nice if, as you said, somewhat duplicated. Could perhaps use a better first example, maybe also suggestions for its use (I'd like to see OpenGL headers using this for vectors, angles, etc).
All in all, it seems a high-quality submission, and I'm prepared to vote for its inclusion in Phobos. -- Simen
