Balloon Tips from the System Tray
You can really easily add system tray function to .NET windows forms by dragging the NotifyIcon object onto your form.
You can then use this to display balloon tips from the system tray with the code below:
myNotifyIcon.ShowBalloonTip(500, "Title", "Tip text", ToolTipIcon.Info);
Very easy and it looks nice too
I have been involved in IT development for the last 10 years - a lot of it around desktop applications and telecoms.