I might be going to the 24 hours of Le Mans this year. My girlfriend wants to do another European trip this year and I might have just convinced here to go to the 24 Hours of Le Mans.

Has anybody gone and experienced the race? I'm looking for the dos and don'ts of attending and what to expect.

I found this article on Jalopnik about it that was educational:
A Jalop's Guide to Attending the 24 Hours of Le Mans

Club Arnage: 24 Hours of Le Mans 2014 seems to be a good resource of information with a downloadable guide and a forum.