Just Try To Forget! DontForget Comes to Pocket PC

"DontForget is easy-to-use and highly customizable Windows Mobile application that can repeatedly remind you of unread SMS text messages, unread MMS multimedia messages, missed calls, unread E-mails and missed calendar events by sound, vibration, notification window or hardware LED.But it is not just an extension for Windows Mobile operating systems which should already be present and preinstalled by the operating system.DontForget also can do much more. You can also schedule to automatically switch your device to certain profile, switch to the Flight-mode in given time of deactivation and much more.And, by purchasing the license you automatically get technical support, upgrades and future enhancements"

My wife used to have a cell phone that would not let you forget about SMS messages. When a message came in at, say, 2 AM, the phone would manically beep every 90 seconds until someone got up to turn it off. Despite hundreds of attempts to silence it by altering various settings, it would not be content with 1 audible notification and then silence.  If this sounds appealing to you, Dontforget may be the application you're looking for. Repeatable notifications are good for some things (e.g. you want to know your server is dead at 3 AM (Or maybe you don't)), and it looks like a sound program, now available in a Pocket PC Version.