CloudFormation! Redshift! EC2! Glacier! Elastic Beanstalk!
Do you, like me, end up staring at the Massive List Of Services on the Amazon console, going "WTF?", and then assuming that since you have no idea what they do, they're probably not meant for you?
If so, you'll probably find this a bit of a revelation:
https://www.expeditedssl.com/aws-in-plain-english
It's a simple guide to what all those randomly-named, confusing-ass things Amazon does are actually used for. And it's fascinating reading if you're an affiliate with a techie lean - I've found at least 3 things I didn't know existed that I'm going to be looking into for campaigns in the future...