If you deploy code that crashes webapp, just revert back to previous version. Problem fixed in a minute on all your servers.
And you don't even need to do that actually, spin new environment with new set of servers. Upload new version to new environment, do the testing, then promote this environment to production status (takes a few seconds), and terminate previous production environment.
Perhaps other companies can offer service like this too, but my platform of choice is ASP.NET which narrows the field quite a bit.
As well as just supporting your preferred vendor (based on price, location, guaranteed location, SLA etc) it means that we can offer you a way to switch between vendors if that vendor has some down-time, or doesn't meet your changing requirements as you move forward.
Also, we are really trying to be as application centric as possible - everything stems from your application code - and then provide the ongoing management tools you need on top of that (for easy scaling, backups, scheduled tasks, migrations, reporting etc)
Great feedback from everyone! We didn't get a whole lot of sleep last night!
Elastic Beanstalk not only handles auto scaling. You can set limits that enable it to launch a replacement server if your pages start responding slowly.
The new console lets you easily add SSL certificates and schedule backups. I was pleasantly surprised how much Amazon has added to it in the last few years.