Database Normalization Basics
An introduction to the concept of normalized database design. This article tells you what normalization is and why you should care. Essential information for going beyond the basics.

Normalizing Your Database: First Normal Form (1NF)
Think of normalization as being a layer cake. The first layer supports all the others and if you do a bad job there, the cake collapses. This article tells you how to do the right thing with the most fundamental normalization.

Normalizing Your Database: Second Normal Form (2NF)
Normalizing is a fundamental principal of database design. Once a database satisfies 1NF requirements, the next level of design is (naturally) 2NF. This About.Com article tells you what that is.

Normalizing Your Database: Third Normal Form (3NF)
The final article in the series about database normalization. More exacting forms of normalization exist, but if you pay attention to these three design principals, you won't go far wrong. A great explanation of an important database design principal.