[17:48:11] srcds@azelphur:~$ vnstat -d

 eth0  /  daily

         day         rx      |     tx      |    total    |   avg. rate
     ------------------------+-------------+-------------+---------------
      05/28/11     12.29 GiB |   53.16 GiB |   65.46 GiB |    6.36 Mbit/s
      05/29/11     12.50 GiB |   51.56 GiB |   64.06 GiB |    6.22 Mbit/s
      05/30/11     11.57 GiB |   49.07 GiB |   60.64 GiB |    5.89 Mbit/s
      05/31/11     10.01 GiB |   40.29 GiB |   50.31 GiB |    4.88 Mbit/s
      06/01/11     10.34 GiB |   44.43 GiB |   54.77 GiB |    5.32 Mbit/s
      06/02/11     11.89 GiB |   48.38 GiB |   60.28 GiB |    5.85 Mbit/s
      06/03/11     12.03 GiB |   48.32 GiB |   60.34 GiB |    5.86 Mbit/s
      06/04/11     14.27 GiB |   52.48 GiB |   66.75 GiB |    6.48 Mbit/s
      06/05/11     16.20 GiB |   56.61 GiB |   72.81 GiB |    7.07 Mbit/s
      06/06/11     10.90 GiB |   45.02 GiB |   55.92 GiB |    5.43 Mbit/s
      06/07/11     11.39 GiB |   43.92 GiB |   55.31 GiB |    5.37 Mbit/s
      06/08/11     12.13 GiB |   48.28 GiB |   60.41 GiB |    5.87 Mbit/s
      06/09/11     11.62 GiB |   49.32 GiB |   60.94 GiB |    5.92 Mbit/s
      06/10/11     11.73 GiB |   50.57 GiB |   62.30 GiB |    6.05 Mbit/s
      06/11/11     12.91 GiB |   53.34 GiB |   66.25 GiB |    6.43 Mbit/s
      06/12/11     13.51 GiB |   55.98 GiB |   69.48 GiB |    6.75 Mbit/s
      06/13/11     13.61 GiB |   57.30 GiB |   70.90 GiB |    6.88 Mbit/s
      06/14/11     12.06 GiB |   50.02 GiB |   62.08 GiB |    6.03 Mbit/s
      06/15/11     11.10 GiB |   45.56 GiB |   56.66 GiB |    5.50 Mbit/s
      06/16/11     10.01 GiB |   39.99 GiB |   50.00 GiB |    4.85 Mbit/s
      06/17/11     11.09 GiB |   44.63 GiB |   55.72 GiB |    5.41 Mbit/s
      06/18/11     12.85 GiB |   53.36 GiB |   66.21 GiB |    6.43 Mbit/s
      06/19/11     12.44 GiB |   49.93 GiB |   62.36 GiB |    6.06 Mbit/s
      06/20/11     11.06 GiB |   45.19 GiB |   56.26 GiB |    5.46 Mbit/s
      06/21/11     11.87 GiB |   50.54 GiB |   62.41 GiB |    6.06 Mbit/s
      06/22/11     12.78 GiB |   54.66 GiB |   67.45 GiB |    6.55 Mbit/s
      06/23/11     12.21 GiB |   49.79 GiB |   62.01 GiB |    6.02 Mbit/s
      06/24/11     24.52 GiB |  109.66 GiB |  134.18 GiB |   13.03 Mbit/s <-- weee
      06/25/11     25.55 GiB |  112.20 GiB |  137.75 GiB |   13.37 Mbit/s
      06/26/11     17.66 GiB |   76.00 GiB |   93.66 GiB |   12.29 Mbit/s
     ------------------------+-------------+-------------+---------------
     estimated     23.88 GiB |  102.76 GiB |  126.64 GiB |