Spb Phone Suite is a collection of all phone features you missed in Windows Mobile. These are features like profiles, call filtering, missed call notifications, reject and reply with SMS, etc. I use this application to give my Pocket PC a profile feature which updates the profile based on what kind of meeting I have and what time it is.
For example if a calendar item have the custom category of business I have set it up so that the phone goes in silent mode which means that it wont play a sound nor vibrate. I have also set it up to ring at max volume when I have it in my car so I may hear it when I drive. Other profiles I use is that it turns off bluetooth after work, but i I drive the bluetooth comes on etc. The possibilities are endless and I reckon you get the picture :)
This is a great application and really a must have for Windows Mobile. It supports Windows Mobile 5 Phone Edition and Windows Mobile 6 Professional
Go here to download and try it, http://www.spbsoftwarehouse.com/pocketpc-software/phonesuite/