Getting Back to Basics

In any art or profession one can never review the fundamentals too frequently. For this reason I am looking at doing some posts on the basics of relational theory. Not so much for the sake of my readers' (Hi, mom!) but more for my own sake. Here is what I currently have planned:

Fundamentals of Relational Theory and Database Design
Fundamentals of T-SQL Querying (2005 and 2008)
T-SQL Queries and DMVs

The third item is really one of my favorites, but I feel I have not put as much effort into it as I should.