Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
XenoNode - XenoNode is one of the leading cloud solutions providers that have employed the best cloud services providers to ensure the quality performance all with peace of mind at very affordable pricing.
Heroku - Agile deployment platform for Ruby, Node.js, Clojure, Java, Python, and Scala. Setup takes only minutes and deploys are instant through git. Leave tedious server maintenance to Heroku and focus on your code.
RamNode - High Performance SSD and SSD-Cached VPSs
Microsoft Azure - Windows Azure and SQL Azure enable you to build, host and scale applications in Microsoft datacenters.
Amazon Route 53 - Amazon Route 53 is a highly available and scalable DNS web service.