I have been really digging into cloud/virtualization lately and ran across an Information Week article I found helpful (pointed out by @mvisser). In particular, I found the table comparing the options out there. Here is a link to the original article.
GoGrid also has posted the July 2009 Gartner Magic Quadrant for Web Hosting and Hosted Cloud System Infrastructure Services (On Demand) here.
I’ve posted a modified version of the table below (including links to the services).
| Company/ Service Name |
Hypervisor Platforms | OS Support |
Minimum Service Contract |
Service-Level Agreement Guarantee | Server Pricing |
 Elastic Compute Cloud (EC2) |
Xen | Windows Server, Red Hat, OpenSolaris, Fedora, OpenSUSE, Debian, Ubuntu, Gentoo | None | 99.95% | Standard: Starts at 10 cents per hour for Linux, 12.5 cents per hour for Windows |
 AT&T Synaptic Hosting |
VMware | Windows, Red Hat | Annual | 99.7% | |
 GNi Dedicated Hosting |
VMware, Xen, Microsoft Virtual Server | Windows, Red Hat, CentOS, Debian, Gentoo, Ubuntu | Monthly | 100% | |
 Computing on Demand |
VMware, Xen | Windows Server, Red Hat, CentOS, SUSE, AIX | Annual | Depends on data center location | $5,700 annual membership, plus per-CPU pricing |
 Cloud Servers |
Xen | Red Hat, Fedora, CentOS, Debian, Ubuntu, Arch, Gentoo | None | 100% | 1.5 cents per hour for 256 MB RAM, 10 GB disk space |
 Savvis Open Cloud Compute |
VMware | Windows Server, Red Hat, Sun Solaris 10 and x86 | Monthly | 99.9%; additional application SLAs up to 99.99% are available | $499 per month for a single core, 4 GB RAM and 32 GB disk space |
 ServePath GoGrid |
Xen | Windows Server, CentOS,Red Hat | None | 100% uptime; for every hour of downtime, customer gets 100 hours free | 19 cents per GB RAM per hour |
 Skytap Virtual Lab |
VMware, Xen | Windows Server, Solaris, | Monthly | 99.9% | Starts at $500 |
 Applogic Virtual Private Servers; Virtual Private Data Center |
Xen | Windows, Solaris, Red Hat, SUSE, Debian, CentOS | Monthly | 99.999% for virtual private data center | Starts at $500 per month |
|
VMware | Windows Server, Red Hat | One year | 99.9% | |
 Verizon Computing As A Service |
VMware | Windows Server, Red Hat | Monthly | 100% if Verizon manages servers | $250 per month plus daily use |
 Public Cloud Gateway |
VMware, Xen | Windows Server, Red Hat, Fedora, Debian, Ubuntu | None | Three tiers: 99.8%, 99.95%, 99.99% | Gold level: 0.20 euro per hour for up to two CPUs |
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