NetworkActiv PIAFCTM (Free Edition)
As seen on TechTV, NetworkActiv Packet Intercepting, Analyzing, File Constructing Traffic Monitor (PIAFCTM) provides not only what you would expect in a good packet analyzer, but also provides HTTP (Web page) file capturing by watching the packets of transferred Web page files and piecing them... 100% freeware and 100% free from ads, spyware, and nags. ... Has a very easy to use, Windows based graphical user interface so that you can get started without reading a book.
http://www.networkactiv.com/NetworkActivPIAFCTMv1.5.exe - 304Kb - Download - Screenshot

NetworkActiv PIAFCTM
Easy yet advanced, quad-mode packet analyzer, Mode 1 (Packet Interceptor) While in this mode, PIAFCTM captures and analyzes network data packets. PIAFCTM allows you to view special information encoded in each packet such as the source and destination IP addresses, the source and destination... With PIAFCTM, you can filter the capturing of packets by IP address, port, packet size, protocol, and/or text-sub-string searching of each packet's content. ... When capturing using the NetworkActiv PIAFCTM Packet Driver, data is captured at the ethernet level allowing you to see the MAC (Media...
http://www.networkactiv.com/NetworkActivPIAFCTMv2.2.exe - 2Mb - Download - Screenshot