Well, anytime you hit a web site it will generate a packet load.
Http://www.eccie.net is a reasonably dense front page (lots of graphics from several sources for the pics, the buttons, the banners, the ads, etc). When you hit the site it fires off connections to load all those things. Multiple HTTP connections from one course can quickly run your packet per second count up.
This will be amplified if you are on a connection where you have any kind of transmission issues which can cause packet retransmits to be needed, or in some cases the computer has to step down to several smaller packets instead of a few large ones which would also drive up the rate.