There are many reasons you may want to sniff the traffic on your own network. When downloading music or video files, a sniffer can tell you the actual file location which makes it easy for you to then go download the file directly to your computer. You can also use a sniffer to see if programs on your computer are making outbound communications, this can help you find spyware and the like. The Free HTTP Sniffer found here (http://www.cleanersoft.com/sniffer/free_http_sniffer.htm) provides a clean simple interface that allows you to track communications on your network in real-time.