I preordered Brink from Amazon.com and never got a code for the bonus stuff. No code came with the game, no code in an email.. Nothing.
What do I do? Is there a way to contact Bethesda? Do I talk to Amazon?

I would suggest contacting Amazon, they have good customer service. Maybe its on your receipt?

Well, I did save my receipt, just in case I needed it for something, but it doesn't say anything about a bonus code.

I got my german version from amazon.de and my bonus code works fine. Just contact the amazon support!

What were Amazon pre-orders supposed to get? I honestly don't know as I pre-ordered it so long ago. I did get my $10 credit (times two actually... I've read of some getting three of them), but never got a DLC pack code.

I've had to contact Amazon about this in the past with a couple other bonus offers they had. They're pretty quick to rectify things like that.

I got The Psycho pack from Amazon.com as well. They also gave me store credit to use towards my next purchase (20$ frikkin DOLLARS omfg...), PLUS they refunded me 5$ for getting BRINK from THEM. So I bought a 1600 MS Point card today from them which basically after my special credit was applied became a 4.98$ shipping fee. So, literally me getting that 5$ back from them, paid for it.

Basically got a 1600 point card for FREE just by buying Brink from Amazon. I LOVE THEM!

They told me 2-3 shipping days AFTER the game shipped. And they shipped it last Monday, and it got here on Tuesday (Release-Date Delivery).

Wednesday (next day), I wokeup and immediately checked my email, and BAM there it was. I was sooo ecstatic!