The development packages for D will be called foo-d-dev. This will allow a foo-d if it's required.
The bindings and include files shall go into the /usr/include/d directory in an structured way: /usr/include/d/al/, /usr/include/d/tango/, /usr/include/d/alsa/, ...
Delerict, when/if it's problems with SONAMEs are fixed, will go into /usr/include/d/derelict/