Digital Ocean / EC2 - any other on-demand cloud providers?

I've put together a quick online calculator to help you figure out how much your IaaS provider is going to screw you for: https://secure.slicify.com/Calculator.aspx.

I have EC2, Digital Ocean, and some others. Am I missing anyone else that sells compute by the hour? (I know there are tons of VPS services that sell monthly, but this is specifically for hourly rates).

thanks Steve