Year over year sales show that the Wii is down (about) 6%, the PS3 is down (about) 20%, the XBox 360 is up (about) 18%, and the HD consoles combined are down (about) 2% ...
Being that last year the Wii saw the release of three of the biggest games of the year by this point in the year (Wii Fit, Super Smash Bros and Mario Kart) and hasn't seen anything similar so far this year, it shouldn't be too big of a surprise that sales are down.
While the XBox 360's lower price has probably translated into some potential Wii owners switching to an XBox 360, I think it is more likely that the XBox 360 is really taking a large chunk of potential PS3 owners away from it.







