Site Down - Site down outage and downtime reports from SiteDown.co
NetSpeedMonitor - NetSpeedMonitor is a lightweight Network Monitoring Toolbar for your Windows Taskbar
Is it Down? - Is it down can check if a website is down or is it just your PC that can not access it.
FreeMeter - Monitor network bandwidth (C#.NET 2k/XP+). Desktop and Systray graph.
Is it up? - A simple tool to check if a website or ip address is up or down.
NetTraffic - Essential network bandwidth monitor.