You can find more information about collections, and guide son how to select the right collection type using these great online resources:

• Commonly Used Collection Types - The MSDN guide for collection types.
• C#/.NET Fundamentals: Choosing the Right Collection Class - A great blog post on choosing the right collection class.
• Why is a LinkedList Generally Slower than a List? - A great question and set of answers on the performance differences between the array-backed List<T> and the LinkedList<T> collections.