I just watched the video of Chris Gray on Channel9. This is a great piece showing how to create a web service to upload pictures from your camerphone to a home server.
Chris Gray - Building your own home server
Chris Gray, a developer in the Windows Server team (yes, we've seen Chris before in the Windows CE videos) shows how to use managed code running on a Windows Mobile device to upload photo's from a Pocket PC to a home server - the demo shows the back end 'server' code and the code running on the device.Video length: 00:28:46.

I call this cooking because this one comes off like a cooking show. A little bit of this and a little bit of that and you end up with something really cool. :)

I should mention that if you want to do this kind of stuff, you follow good security practices. Check out this book for information:

Improving Web Application Security: Threats and Countermeasures