i dont think Intels new stuff which will take DDR2 is out yet, but i dont really follow intel too much so im not sure. might change shortly though....
just get a mb that takes DDR, with AMD that'd be a board that takes socket939 chips. you dont HAVE to get DDR2 just beacuase its newest, theres still a lot of debate over whether or not its any better at present. as it is, it appears to be a bit cheaper than standard DDR
i bought a Asus board less the 3 weeks ago which is a socket 939 and takes DDR, which also has 2 16x PCI-E slots. im planning on going down the Opteron route which doesnt appear to be available on the new AM2 standard at the moment.