I believe it is very helpful for you to sit down and write a chronology of what took place.  Start with your hire date (if you were hired ten years ago you can just put that date down and if nothing unusual took place for the first nine years, just make your next entry the date of the unusual event).  You should include the date, event, who was a witness to the event, that persons job title and what documents relate to the event. 

This document is utilized in conjunction with the cast of characters to make sure you don't miss any important facts and to ensure that while things are fresh in your mind you are putting them down so I can review.  Remember that if you create this and the cast of characters for me in anticipation of litigation we can argue a privilege exists and they may not have to be disclosed to the other side during litigation.

I find these documents very helpful when sending out an initial demand letter, negotiating a settlement or during the discovery process.  The more time you spend on these two documents up front, the better your chances for a successful outcome.