Yeah, there's a lot more stuff I could have talked about, but I think I'll leave it for other posts.

About testing, I think the way protection works in D (i.e., private members are accessible within the same file) is important, too.  I was a bit suspicious of that feature when I first looked at D (coming from C++) but now I actually like the kind of project structure it leads to.  I think better testability is just one of the advantages, but I'll write up a full blog post sometime.