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NetSpeedMonitor is a lightweight Network Monitoring Toolbar for your Windows Taskbar designed to be used on computers that run Windows XP, Windows Server 2003, Windows Vista or Windows 7. With NetSpeedMonitor you can monitor the current speed (up- and downstream) of your Network Interfaces and the amount of data transferred. In addition to the Connection Table with all TCP/UDP endpoints and the Toolbar Tooltip with a quick and short traffic overview, you can also see detailed daily and monthly Traffic Statistics. NetSpeedMonitor toolbar requires no additional drivers like other Network Monitoring tools do!

I have found some problem with it

Clear graphic and/or numeric display.
Usage reports with export to a variety of file formats, including Excel, MS Word and HTML.
Permits close supervision of uploads and downloads.
Works with dial-up, ISDN, cable modems, ADSL, Ethernet cards, and more.
Includes network information & testing tools with advanced netstat that displays applications using your Internet connection.
Option to notify user or disconnect from the Internet automatically when network activity exceeds a certain level.
Speed meter to accurately time downloads and report the average transfer rates.
Dial-up session journal with detailed information about every session.
Absolutely free and does not contain any adware/spyware/malware.