Data Modeling and Database Design (X-402.5)
Useful Links
Normalization
A Simple Guide to Five Normal Forms in Relational Database Theory (William Kent)
Database Normalization Basics (Microsoft)
Normalization: Jose's Database Programming Corner
Database Normalization (Database Journal)
Data Management
TDAN (The Data Administration Newsletter
Other
CA ERwin Data Modeler Community Edition (free 1 year license)