I love MKV and I have hopes that one day in the distant future people will standardize on it since it's such a great container format and an open standard.
I've been pushing mkv on clients for a while now and some who play things I do for them in lobbies on big tvs or on video boxes like WD TV Live or something don't care because it just works. Which is what I tell them, "Yup, .mkv just works," I'll say subtly pushing it into the recesses of their brains so they hopefully end up parroting it later to others.
Anyways, MakeMKV was just updated. Yayz! (and it's currently FREE)