I had never heard it either until I watched an episode of Journey Home, where Marcus Grodi interviewed an Anglican "Use" priest. It was a riveting program. As Siobhan pointed out, two of the forum posters, sockmonkey and B-Chan, are members of the Anglican Use Church community.
In 1980, His Holiness Pope John Paul II granted a Pastoral Provision for the establishment of parishes composed of former Episcopalians which could use a modified liturgy from _The Book of Common Prayer_. There are, at present, six parishes in the USA now using the Anglican Use liturgy. (There are other groups now forming. Canonically, any groups seeking permission to use the Anglican Use liturgy must be composed of former Episcopalians. But once permission is given any Catholic may participate.) These parishes are in the Roman Rite of the Catholic Church, but permitted to have their own distinctive liturgy and also permitted to follow their own customs at Mass.
This link will give you the historical perspective on this Anglican rite: