Web Matrix Hosting
WebMatrixHosting can be an ideal web-host for you. Its 100% free, and provide lot of goodies, including SQL Server hosting. This page has the complete feature list, and the FAQs are here.
There are couples of restrictions in the offer such as
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You need to FTP and change contents once in two months
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Few file types and file size restrictions
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You cannot host against your own domain name.
If you are working in Asp.Net exclusively and looking for temporary hosts for demonstration purposes, this can be the best deal!