NetSpeedMonitor - NetSpeedMonitor is a lightweight Network Monitoring Toolbar for your Windows Taskbar
Is It Down Right Now? - Network & Admin
FreeMeter - Monitor network bandwidth (C#.NET 2k/XP+). Desktop and Systray graph.
UPDOWNtoday - UPDOWNTODAY allows you to check whether the website is down or not.
NetTraffic - Essential network bandwidth monitor.
Site Down - Site down outage and downtime reports from SiteDown.co