Not directly answering your question, but I've actually gotten interested in D because I wanted to learn something I can code hardcore stuff in (I mostly do web: js, dart, ruby, bitcoin in js). So I started learning D and thought I should try myself writing a simple Terminal emulator - this idea intrigued me because I didn't know where to start and how it all comes together. Then someone pointed me to a terminal emulator written in D: https://github.com/gnunn1/terminix - I decided I should probably study it and understand how various parts come together. From the description and the looks of it, it looks great.