One of the best online locations read up on general data structures and asymptotic time complexities would be the following URL

http://en.wikibooks.org/wiki/Programming:Data_Structures

This document gives a really great overview of all the major CS data structures and it even gives a nice explenation of Time-Complexities without going too in depth (It gets confusing when you start calculating complexities of recursive algorithms )

Some of the pseudo-code and impelementations may be hard to understand, but what you cannot figure out based on this document you can definitely google. I was looking at the Linked-List explanation and I have defenitely seen better explanations before. There is no need to complicate such a simple concept...

Good luck!