Network Monitor displays all kind of information in real time (1-second
update) about all network adapters (network cards, RAS connections,
virtual cards, server monitoring for web hosting) in your system. And it
is FREE!

Network Monitor displays for each network adapter: download speed,
upload speed, data transfered, IP address, MTU size, adapter type, MAC
address, status and many more.
http://www.bysoft.com/