Nintendo are reportedly looking to take on more manufacturer contract suppliers in a bid to ramp up production of the Wii hardware. Three Taiwanese companies are in the frame; Sunplus Technology, Wistron and Lite-On, covering controller chips, assembly and power supplies respectively.
Whether these are temporary contracts just to cover the Christmas rush period or permanent affairs is not clear, although the sustained global demand and continued hype does tend to suggest it is the latter. How long these companies will take to get up to speed and therefore the time for the new machines to get to market was also not reported.
This of course is a bit of a gamble for Nintendo. If they don't increase supply then they may well suffer lost revenue and risk other manufacturers claiming this market share, but if they do invest in new production lines and find the demand tails off then financially they could lose a substantial amount.