Good :) I just skimmed through the thread, so I don't know if you're still using Code::Blocks.
I'm using it, and it highlights D code with no problem. For 10.05, it's in Settings > Editor > Syntax Highlighting > syntax highlighting for D (default color scheme)
The keyword list might need to be updated a bit, maybe. I don't know if the original install has 'immutable' as a keyword, for example.

Philippe