presently, most software houses are re-optimizing their software.
The main graphics companies are doing this to insure that they'll be the first to state the fact and to be as competive as possible, others who don't will be left in the dust!!!
I doubt that any office app will take advantage of Intel's innovations, most likely it will be the cad, 2d/3d, games and high-end visual software that will take sse2 into account.
hopes this helps!