After talking to my friends Robert La Gesse from Rackspace Cloud and @vidluther from ThirdPartyCode, I decided messing with domain alias feature of Rackspace Cloud Sites so I could save money from getting a Cloud Server, VPS or slicehost.

If you need to run multiple-separate domains and one base master WordPress template theme with multiple children themes (like what I needed was a product site, 2 blogs, a community and a corporate site) without the need for wildcard subdomains or subfolders per blog/site then running a single instance of code and database on Rackspace Cloud Sites is possible using their domain alias feature.
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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:

• Overview of modified Medium Trust
• How do I add impersonation to my ASP.NET site?

Cheers to the folks at Rackspace Cloud! PS When can I expect Cloud Servers to run Windows in a vm ?