ASUS's A7M266 is one of the first boards based on the AMD 760 chipset, which brings with it DDR RAM support. The other new thing is the 266MHz bus speed support, this isn't all that important now with all the KT133A based boards around. So the DDR support is what makes this board something new. The other thing you will notice about is that this board is big. It is actually bigger then my KT7-RAID which is a big board.
FULL STORY @ IAMNOTAGEEK (http://www.iamnotageek.com/cgi-bin/reviews.cgi?name=a7m266&p=1)