Thursday Code Puzzler: Remove Duplicates From a Linked List

It's Thursday, so it's time for another code puzzler. The idea is simple: solve the coding problem as efficiently as you can, in any language or framework that you find suitable.

Note: Even though there really is nothing stopping you from finding a solution to this on the internet, try to keep honest, and come up with your own answer.  It's all about the participation!

Remove Duplicates from a Linked List

Given an unsorted linked list, and without using a temporary buffer, write a method that will delete any duplicates from the linked list. 

Catch up on all our previous puzzlers here