my guess is ps3->psp->wii->ds->360
sony has only 1 million to go and is getting pretty decent sales now.
psp has solid sales and is 1.2 million away (it might get there first though.
wii has very strong sales and a good 2 million to go.
ds is amazing but it needs 3.5 million.
xbox is doing terribly and im putting even less on its price cut than the ps3's. it needs .7 million and that will be hard for it.