Ever forgotten that your Treo is on slient mode and thus missed a call? I'm sure you have. VibOff will make this scenario a thing of the past by informing you when your device is switched to silent.
You can select whether you want the device to vibe once or three times when you turn your Treo off, ensuring that you always know when your tones are turned off.
The application is very, very simple but it won't appear in the Launcher, rather hiding itself in the Preferences Panel. It doesn't do anything else apart from alert you when you're on silent, but it's still a handy little utility.