Okami Wii sells nearly 50k in four days. Not too shabby.

[SaviorX]

Okami came late in the PS2s lifetime and sold 270-280k. The Wii version will probably sell 63k first week (just guessing). So assuming the Wii goes onto last another 4 years, that give Okami plenty of time to gain word of mouth notoriety and push past the sales of its PS2 counterpart. I throw 420k lifetime sales out there. Hopefully it hits 500k someday in the near future.