Understanding SQL Server Execution Plan
An execution plan explains the processing approach (including multiple intermediate steps) used by the query optimizer to execute a query. Below are the best resources you could get to understand the SQL Server Execution Plan.
SQL Tuning Tutorial - Understanding a Database Execution Plan (1)
Codeproject
Execution Plan Basics
Simple Talk
SQL Server Execution Plans
SQL Server Central
SQL Server Query Execution Plan Analysis
SQL Server Performance
Sql Server Actual Execution Plan Vs Estimated Execution Plan
SQL Authority
Understanding Microsoft SQL Server Execution Plans
Channel9
Understanding Execution Plans Part 1
SQL Server Central
Understanding Query Plans
Sqlmag
SQL Server Execution Plans By Grant Fritchey
Red Gate
Understanding More Complex Query Plans
Simple Talk
How do I obtain a Query Execution Plan?
StackOverflow
How to read a execution plan in SQL Server
StackOverflow