Official website of the Holy See.
Old, but wise.
Entire books you can download. The Catholic texts alone are enough to keep you reading for a long, long time.
Lots of useful stuff, including Vatican documents.
Dave Armstrong's huge and hugely helpful apologetics site.
My daughter is an alumna — what a fine Catholic institution!
Not great bedtime reading, but if you have questions about Canon Law, here it is.
Karl Keating and Co. Great help for the serious apologist and the beginner, too.
A good place to learn about the saints.
Mark Shea's blogspot. A pioneering Catholic blogger who remains one of the best-witty and provocative.
Almost as good as his blog!
Greg Popcak and Co. Lots of helpful insights here.
Amy Welborn's blogspot. Great stuff.
A ministry of Catholic resources from Dr. Marcellino D'Ambrosio
Catholic news and commentary.
Your faith. Your life. Your world.