I don't see it happening before November myself, My EOY predictions put Wii 2 million above the combined PS360, but considering those last 2 months sales I think the 2 million will come all from Nov+Dec (8 mil Wii and 6 mil PS360)
So my prediction has Wii getting 50% about 1st week of Nov,... perhaps I should have looked at that before saying December.
JL probably predicts May or June to be the magic number month