Cloud Guru - $50/mo video learning for multiple clouds and tracks
CSAA Cheat Sheet - Long long PDF of all AWS Cloud Solutions Architect topics
Another Architect Info Page - and that site is a training site, but I haven't used it.
AWS Services FAQ - Info on everything AWS offers
AWS Stash - Tons of random resources
Well Architected Framework - Whitepaper on cloud design and deployment, widely cited
Misc. AWS stuff too lazy to make pretty