Ash Wednesday and Lent Readings

'Lent: Why the Christian Must Deny Himself,' a two-part series here and here. 

Mike Aquilina's three-part series on prayer, fasting and almsgiving at his blog here.

Pope Benedict XVI's catechesis on the subject of Lent which he gave last February 22, here. 

Lastly, check out this extensive list of resources and Q&A's here for Ash Wednesday and Lent.