FreeMeter - Monitor network bandwidth (C#.NET 2k/XP+). Desktop and Systray graph.
NetLimiter - NetLimiter is an ultimate Internet traffic control and monitoring tool designed for Windows.
TrafficMonitor - TrafficMonitor is a network monitoring suspension window software in Windows.
NetBalancer - NetBalancer is a Windows application for local network traffic control and monitoring.
NetSpeedMonitor - NetSpeedMonitor is a lightweight Network Monitoring Toolbar for your Windows Taskbar
Bandwidth Manager - Bandwidth management, bandwidth limiting and traffic shaping software for Windows