1. Jesse Weisbeck has built this crossword puzzle to provide an enhanced, more intuitive user experience with javascript.
2. Ash Kyd did bug fixes and added cool features (e.g. the "reveal a random letter" cheat).
3. The Dod added rot13 (against accidental peeking) and an example puzzle that uses it (EFF's Xmas 2013 NSA puzzle).

Your turn :)