Today is (well, was at this hour) the first day of the Autumnal Ember Days. Here's some good articles about Ember Days. It seems ironic that in the hurry to restore things from the early Church into the liturgy, one of the oldest traditions was not only downplayed but in actuality dropped by the wayside.
From Fr. Z's blog:
EMBER DAY AWARENESS … DAY
From The New Liturgical Movement:
Ember Days: Explanation and Two Proposals [UPDATED]
and of course the Catholic Encyclopedia