While DDR2 still holds its own in the market place, Intel has already signed DDR2 to the back benches. The only boards that will come from Intel with DDR2 are current and past generation chipsets. None of the new Core i7 series will have any DDR2 support since the memory controller is being moved onto the CPU itself. And with AMDs plans for the AM3+ series soon to poke its head out of the sand, DDR2 is finally coming to a close. This brings on the era of DDR3.
Unfortunately DDR3 still costs more per MB than DDR2, this is due to the higher yields that are needed and the extra technology that has to go into DDR3 to make it work. But when it does, its clock speeds are well beyond anything that DDR2 could ever hope to achieve and we are seeing that now.
Team Groups DDR3-1866 kit, while not reaching the desired speed today, this was mostly due to not having a huge amount of time to tinker with the settings. However, with more tweaking it's sure to manage more. And while only making 1850MHz of its 1866MHz, it's still one of the fastest kits on the market today.