I use a few EC2 scaling features and always find them needing a little more TLC from Amazon. There are some simple quality of life things that would make my setup simpler. Recently I've been moving some of our less frequently used services to Heroku as their billing model suites infrequent usage really well.

Of course, you have to take the suggestions and examples on this page with a pinch of salt since they're selling their own products.

off topic: it's difficulty to read this post on mobile because the social sharing widget covers up the first few rows of letters on each line.