Watching traffic on FreeBSD

Ben Wong at MostlyGeek pointed out that a great way to watch traffic on FreeBSD is the command systat -ifstat 1 which shows:

                    /0   /1   /2   /3   /4   /5   /6   /7   /8   /9   /10
     Load Average   ||   

      Interface           Traffic               Peak                Total


            lo0  in      0.000 KB/s          0.000 KB/s            4.122 MB
                 out     0.000 KB/s          0.000 KB/s            4.122 MB

           bge0  in      6.181 KB/s         36.944 KB/s            1.666 GB
                 out   110.521 KB/s        670.040 KB/s            3.444 GB