For those of you folks who are considering a cloud hosting solution for your ASP.NET web apps with or without WCF services, I strongly recommend you test out Rackspace Cloud.
I had some trouble getting things working but found an excellent article that should help you .NET developers looking to use Rackspace Cloud Sites as solution to host your ASP.NET web sites, web apps or WCF services.
Since cloud hosting has different conditions for security and reliability, there are some other considerations that you should check out at the Help support area of the Rackspace Cloud:
Cheers to the folks at Rackspace Cloud! PS When can I expect Cloud Servers to run Windows in a vm 
?