Cloud Scan is a solution that I built using Windows Phone, .NET and Windows Azure technologies.
Here is a video that demonstrates the functionality of the Windows Phone application.
The application has the following features:
1. Windows Client to Upload to Azure Storage Account
2. Windows Phone Client to categorize uploaded documents
3. ASP.NET Web Application that allows you to browse your documents remotely
Let me know what you think! If there is enough interest I will publish the application for others to use.