Last week I posted an application called The Mobile Secretary. A little application that auto-responds to missed calls as well as a few other options. Thank you for all of the feedback! I'll be looking to add some of the requested features in the next revision. Itching for the feature requests?? Why wait for me to do it? I have posted the source code for you to look at and play with.
You can also grab the latest cab (currently the same as I last posted) at http://www.wimobot.com/wmapps/mobilesecretary. Yes, as you can see I am sharing my wimobot server... feel free to check out that project too if you are interested in the Windows Mobile Robot :)
I hope that the source code will help to demonstrate some of the really cool APIs we have available in Windows Mobile. If you have any questions about the source, please don't hesitate to ask. And as always, any feedback on the application is always welcome!