someone finally made a utility for the iphone to constantly alert you when you have unread sms messages. usually the iphone just vibrates and alerts once when you get a message and if you miss those, you usually never notice the message until much later. the continuous nagging was something i missed from my treo.
however, i didn't like that it vibrates every 15 seconds and that it will vibrate right after you get a message even if you haven't really "missed" it. since it's just a shell script that calls "sleep 15", it isn't really smart about what a missed message is. so i modified it to wait 60 seconds between alerts and only alert when an unread message is older than 60 seconds, so you have time to actually see the new message before being nagged about it.