FreeMeter - Monitor network bandwidth (C#.NET 2k/XP+). Desktop and Systray graph.
NetSpeedMonitor - NetSpeedMonitor is a lightweight Network Monitoring Toolbar for your Windows Taskbar
Network Lights - Network Lights is a Windows program, which blinks keyboard LEDs (Light Emitting Diode) indicating outgoing and incoming network packets on network interface.
NetTraffic - Essential network bandwidth monitor.
NetWorx - NetWorx is a simple and powerful tool that helps you objectively evaluate your bandwidth situation.
NetBalancer - NetBalancer is a Windows application for local network traffic control and monitoring.