With Azure Service Bus you can connect your on premise SQL to Azure Web Sites and the like. I haven’t had a chance to do this my self, keep looking for more posts related to Azure Service Bus.
This is how you would configure hybrid model for resale. http://www.bradygaster.com/post/windowsazurewebsites-onprem-servicebus
This is how you would configure a hybrid model for single use http://azure.microsoft.com/en-us/documentation/articles/web-sites-hybrid-connection-get-started/