Today is Ash Wednesday, the beginning of Lent.
Everything you wanted to know about Lent from Aggies Catholics: The Annual Lenten Mega-Post for 2011.
Praying Lent from Creighton University.
A Comprehensive Guide to Lent: History, Resources, Links, and FAQ from ChurchYear.Net including their fine Church Fathers Lenten Reading Plan.
This plan is included in the Fr. Jerabek's Lenten Reading Plans page along with ones dedicated to the saints, to Fr. Faber and Cardinal Newman, and to St. Jean Marie Vianney.
From Dom Prosper Guéranger's "The Liturgical Year"
Lent - Preface
Ch. 1 - The History of Lent
Ch. 2 - The Mystery of Lent
Ch. 3 - Practice During Lent
Introit or entrance chant for Ash Wednesday, Misereris Omnium: