What are some alternatives?
When comparing XenoNode and Google Compute Engine, you can also consider the following products
Hetzner - Server hosting provider.
DigitalOcean - Simplifying cloud hosting. Deploy an SSD cloud server in 55 seconds.
BHost - BHost is the provider of VPS hosting with unmetered bandwidth.
Microsoft Azure - Windows Azure and SQL Azure enable you to build, host and scale applications in Microsoft datacenters.
SolVPS - SolVPS deliver the on-demand cloud hosting solutions including premium VPS hosting and cloud web hosting for the small business.
Amazon EC2 - Amazon Web Services offers reliable, scalable, and inexpensive cloud computing services. Free to join, pay only for what you use.