i've seen those before...it really is a waste of money. A cat5 cable only uses 4 of the 8 wires that are available, so a splitter (at least the one's I've seen) will have a 2port pigtail that you plug into the cable and in essence have two computers running over the same cat5 line. The resaon this is so crappy is crosstalk and the fact that for the same $20-30 you could buy a 4-8 port switch/router that does the same thing without the crosstalk. It is just another gimmick.
http://www.cyberguys.com/templates/s...sp?T1=120+6510