I could add something for Ruby but I'm not really sure what to add. The the content for the existing languages is quite different compared with each other.
Often one doesn't know what one wants to write till one starts. I guess the focus will be different coming from Ruby than coming from Basic, because people think in different ways and tend to be solving different sorts of problems - so I should think there is no need to strive for uniformity at this stage. Just making a start is a big improvement on a blank page - it doesn't need to be excellent on day one.
Maybe just try to remember what you struggled with (or would struggle with) when learning D as a Ruby guy. What are the cool futures in Ruby that you can do, or do better in D? What are the traps and 'faux amis' (things in D that don't do what one might think if coming from a Ruby background)?
Go has not just a wiki entry, but a whole book on "Go for Python programmers". D is different from Go, but maybe we should make the whole experience for newcomers just a little bit easier.
