If you are a new bee to LINQ (Language Integrated Query), stunned by looking at big books and longer web pages on it, here is the relaxing news. Read “LINQ: The Future of Data Access in C# 3.0” by Joe Hummel. He presented LINQ in a simple and effective manner.
This book with 60 pages quickly give you pragmatic understanding of LINQ and push you to start using it in next hour. This is a good quick starter book in spades.
I personally prefer reading such quick start books to get glimpse of technology and later pick thicker book or detailed tech web links to dig deeper.