confusing packet data

[yahoo at jimpop.com (Jim Popovitch)]

This is something has been bugging me lately.... Etherape is a Linux
tool that graphs packets arriving at your host, and shows paths of
connectivity.   I captured the graphs, at the URL below, from my Linux
laptop connected to a Linksys wifi router that is hooked to a Comcast
cable modem.   Why is it that I can see packet data from IPs all over
the place?

http://picasaweb.google.com/jimpop/Public#

Any insight is much appreciated.

-Jim P.