NetSpeedMonitor - NetSpeedMonitor is a lightweight Network Monitoring Toolbar for your Windows Taskbar
Venmon - Compact size system resources monitoring utility and multi-ping tool for Windows
NetTraffic - Essential network bandwidth monitor.
TinyResMeter - TinyResMeter is a small tool that displays useful information about system resources in real time...
FreeMeter - Monitor network bandwidth (C#.NET 2k/XP+). Desktop and Systray graph.
Mousotron - Mousotron is a mouse and keyboard activity monitor and keeps statistics of your mileage. It's like an odometer or tripometer for your mouse cursor.