The tutorials below are for singly-linked lists.
1. Linked List Basics (Stanford). A very nice tutorial in C.
2. Linked List Problems (Stanford). Part 2 of the above. Great practice problems!
3. Linked List Tutorial in Java (macosxnerd101 in dreamincode.net). This tutorial is very comprehensive and uses Java, which i great to be familiar with linked lists without having to mess around with pointers. (Disclaimer: This will come and get you later!) This one also has some clues on how doubly-linked lists work.
4. Linked Lists (iACADEMY, Professor Benett Tanyag), a PowerPoint tutorial.