Here are screenshots of reports hosted on SQL Azure reporting preview accessed via Windows Phone, iPhone and Android Smartphone. I knew one can access reports using browser and so just wanted to test them on Windows Phone, iPhone and Android.

Note: Report is just for demo purpose. So I have kept it very simple.

Here are the screenshots:

1. Windows Phone:

2. iPhone:

3. Android Smartphone:

Note: I have not tested it but I have heard reports on SQL Azure reporting are accessible via iPad too. 

Simran Jindal confirmed that It works great on iPad too!

Conclusion: These opens up a whole new world of possibilities for businesses. Business users would be able to get access to reports from anywhere in the world. Think of reports that are built on top of Data Marts hosted on cloud. They are kept in sync with Data that resides on-premise (locally). We have exciting times ahead!

Resource:
Getting Started Guide for Report Readers (SQL Azure Reporting)
Guidelines and Limitations for SQL Azure Reporting Preview