1)Please recommend to me any cloud analogs of Mule ESB.
2)Are there any solutions for scaling (autoscaling) Mule ESB on clouds (amazon preffered)? (for example if i will use EC2)
CloudHub is the de-facto cloud offer for Mule. It doesn't support auto-scaling AFAIK but you can easily control the number of deployed nodes with a simple slider. It also exposes a complete API so you can programmatically control your deployed applications and scale them.