[Kayemay]

W have recently moved and suddenly my internet usage has doubled from about 5 gig a month to 10 gig. I do use face book a lot but did so previously as well. I am mindful of how much we have been using lately so I am not downloading as much as I used too but still in one day I used over 2500mb and that day I was away most of the day so would like to know if there is a program that can tell me which sites are the hungry ones. We have 2 computers so I would either need one that can be put on to both and check both or if its possible to get one program to read both and tally for me. I have checked the net but all I can find so far are trackers for usage that will tell me when I have reached a particular limit or how much was used this day, my ISP has this so I can check that easily enough.
I am using Windows 7, on a PC and the other comp is using Mandriva.
I am not a novice but I am also not an expert on computers.