I just saw an interesting video with footage of the late Lubavitcher Rebbe talking Hebrew to a visiting Israeli group (via crownheights.info). It was geshmak, hearing him speak it in such a Litvishe way.
Eliezer ben Yehudah, the man behind the modern revival of Hebrew as a spoken language, was from a Habad background. So why didn't he put things in place for modern Hebrew to be spoken as the late Rebbe spoke it? Oy, would that be great!