I think you want something like http://www.netlimiter.com/ but I would be guessing if you wanted it to report to some central web page.
Bob
I currently have have a wireless router connected to my ADSL2+ at home. Is there a program that allows me to monitor download/upload usage from all users weather they are connected Ethernet or wireless????

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic