On Coding4Fun there is a article demonstrating how to use a Windows Mobile 5 device to control Windows Media Center. This looks a great article and it uses the Windows Media Center SDK, the Windows Mobile 5.0 SDK and Visual Basic or C#
It takes you step by step through creating a Media Center Presentation Layer Application, creating an AddIn for the mobile client to talk to and creating the Windows Mobile 5 client application. It is a very complete sample with C# and VB code (which is nice for us VB devs)
This would be great to use on my Windows Mobile Treo
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