I'm not sure whether this place is ok for posting some improvement ideas but anyway:
each time my Windows taskbar hangs for any reason (explorer.exe crashes and automatically restarts, very often for my lap + vista), after recover of process, tray icon of Xampp dissapears and doesn't restore with explorer. Xampp doesn't refresh it any longer and there is no way to get Xampp-control's window back again since this tray is only way to access this window when it's closed. Of course xampp-control.exe is running but I have no idea how to get that window back, except killing this process and re-launch xampp-control.
Instead of displaying warning "xampp control panel is already running" it should re-pop main window and refresh its tray icon.