There are many, many websites that exist which are devoted to blackjack. 
Here is just a small offering of some of the better sites that I have found:

Blackjack.Com
The Blackjack Page
Blackjack Bootcamp
Blackjack Without Tears
Blackjack in South Africa
A Guide To Blackjack Books
The Basic Rules of Blackjack
The Blackjack Review Network
The Silver Fox Blackjack System
Ralph Stricker's Blackjack Articles
Blackjack Conditions and Specials
The Blackjack Basic Strategy Engine
The Official Site of Lawerence Revere
Gail Beddow's Simplified Blackjack Strategy
Frequently Asked Questions about Blackjack
Gambling Times Presents THE GAMBLING CONNECTION - Basics of....BLACKJACK