Category 5 E Cable (enhanced): Same as Category 5, except that it is made to somewhat more stringent standards (see comparison chart below). The Category 5 E standard is now officially part of the 568A standard. Category 5 E is recommended for all new installations, and was designed for transmission speeds of up to 1 gigabit per second (Gigabit Ethernet).


Category 6: Same as Category 5 E, except that it is made to a higher standard (see comparison chart below). The Category 6 standard is now officially part of the 568A standard.


from: http://www.lanshack.com/cat5e-tutorial.aspx

sounds like cat6 is just made with higher standards, but it doesn't say what the benefit is. :madr: