I built an email newsletter system using Lambda, SQS, DynamoDB, S3, and SES.<p>I think it is a perfect application for that stack because it gets nearly 100% uptime and durability without having to worry about keeping a server up. Even if I was handling 1000 requests a day, it wouldn't be worth keeping a server running, but if it grows I can scale it up quickly by just turning a few knobs.