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