If you're looking into AWS EC2 servers for hosting an application, check out
Heroku | Cloud Application Platform which adds ultra-simple deployment/operations on top of it.
Beyond that, check out these AWS services:
- S3 (hosting assets like audio/images/video)
https://aws.amazon.com/s3/
- Elastic Transcoder (transcode audio/video)
https://aws.amazon.com/elastictranscoder/
- RDS (relational database hosting like MySQL/Postgres)
https://aws.amazon.com/rds
Those are probably the most commonly used AWS services among webdevs. Just about everyone has a use for S3.
As for the comments saying it's expensive, I'm not really aware of a better offering than S3 and RDS that compete on quality and price. You're not really the target market if cheap shared PHP hosting does the job.
What's crazy is that AWS owns 90% of the market:
Gartner: Amazon?s cloud is 10x bigger than its next 14 competitors, combined | Network World