Will pass within this year.
Maybe July/August

Don't forget folks, last year at this time Nintendo was only making (and selling) 1m/month. This year it's nearly double that. So come January - March Wii will make up a LOT of ground as it continues to sell-out (based on pent-up demand, Wii Fit, SSBB) and the x360 does the normal after holidays drop in sales.
Once GTAIV comes out, I expect a price drop from MS at the same time and that will spike their NA sales to almost Halo levels, and they'll likely outsell Wii for a week or two in NA. Within a month after that, they'll permenantly lose the lead.

Bah i get confused with your silly American date format.... The 1st of April 2008 is 1/4/2008 not 4/1/2008.

@topic yes probably, if it does it will be earlier than I thought a few months back, I guessed it would take till May of June at least.

This should be obvious. Look at both systems LTD in the US right now. Now realize Wii has had 1 year and 360 had 2 years PLUS a MAJOR year packed with releases. Not even price drop+GTA4 will hold a candle to Wiifit Smashbros and a $199 price tag Wii. Its going to be a massacre.

Nah.

OK, let's step out of the realm of "yes it will" versus "no it won't" and look at some actual numbers. I've yet to see anyone aside from the topic creator actually do that.

As said initially, the Wii is currently 2.32m units behind the 360. That's quite a lot of consoles to make up, even for the Wii. Whether or not it will pass the 360 by the beginning of April will depend heavily on what happens in the next two weeks, before 2007 comes to a close. I'm still waiting to see whether or not the Wii numbers are quite as massive for this week as many are hoping.

Still, let's assume for the sake of argument that the Wii can make up a full million units before the end of 2007, leaving it only 1.32m units behind. (I actually don't think it will do quite that well, but go with it for argument's sake.) With that assumption in mind, will the Wii pass the 360 before the beginning of April? Here are the comparison numbers from Q1 2007:

VGChartz Hardware data for the period 07th Jan 2007 to 01st Apr 2007:

This is for America only, obviously. Here's where the numbers I get don't stack up with the numbers of the topic creator. According to VGChartz, the Wii only outsold the 360 by about 300k units in the first quarter of last year. In order to meet the sales target we're discussing here, Wii sales will need to more than quadrule that margin of victory... and that's assuming that 360 sales don't see any increase either. I'm sorry, but I'm not seeing that happen.

So IF the Wii makes up a million units on the 360 in the next two weeks (that's make up a million, not sell a million!) and IF 360 sales stay level and IF the Wii sells DOUBLE what it did last year in the first quarter, then yes, it will pass the 360 in America before April. Unfortunately, there's a lot of "ifs" in there.

The Wii is definitely going to pass the 360 in American sales, but it's probably going to happen during the late spring or early summer. Think May/June 2008.

 Agreed. I thought he meant the fourth of January.

 According to my prediction the X360 will pass the Wii in America in October '08. So we'll see!

Crap I forgot to mention I was speaking of Leo J and not the topic creator. I dont think it will happen by April, but it will happen in 2008.

I also don't believe april will be teh month the Wii passes 360 in America. I am putting it at least July.