Try the following ...
http://www.cc.gatech.edu/gvu/stats/NSF/merit.html
Merit NIC NSFNET backbone statistics provided by Ga Tech's Graphics Vis &
Usage Center (GVU)
This group has also done some survey work on users and usage of the Web.
Perhaps also of interest ...
http://www.ncsa.uiuc.edu:80/SDG/IT94/Proceedings/DDay/sedayao/mos_traf_paper
.html
"Mosaic Will Kill My Network!" -
Studying Network Traffic Patterns of
Mosaic Use
A WWW2 paper by Jeff Sedayao, Software Systems Engineer, Intel Corporation
Bruce