Yep, DDR2 is starting to yield some nice results. There are a lot of DDR2 800 sticks with Cas 4 now, which isn't bad. The D9 sticks have been hitting nice speeds with low timings for a while now.
As far as volts, Coolaler showed off the DFI Infinity board with the 975x chipset and it has vdimm to 2.65, so I am guessing the LP boards coming out should go higher than that (I hope), volt mods might not be as necessary hear soon.