My take
DS: I'm am still stunned by the DS performance. Almost 500k units in February. I know there were shortages, but DAMN! Given that the PS2 is still selling well in the US and Europe after 6 1/2 years, it probably won't have the longevity to pass the PS2. But, it's certainly had the best 2 year performace ever.
Wii: The Wii is still supply constrained and right now, looks like the system to beat in all 3 regions. It's clearly #1 in Japan and Europe and I don't doubt once it gets past it's shortages in the US that it will still have high demand and be ahead of the 360, at least until a price drop.
PS2: Still great numbers and still not at $99. This system will end up selling 130M units by the time this generation is over.
360: A good showing. The number in and of itself isn't great, but it is February and these system has been @ $400 for 16 months now, it's doing quite well.
PSP: Good HW numbers, given it's now at 2 years with no real price drop, but as we all know SW numbers are horrible. At this point, I see no reason for publishers to do anything with the system. There's absolutely no reward and significant risk.
GBA: Slowing down, but still putting money in Nintendo's pockets.
PS3: Worse than anyone could have imagined months ago. I felt it would be bad, but still bumped up my prediction to 160k. I was going to go with 150k. Motorstorm, F1, & Oblivion will likely severely underperform as they aren't going to sell systems and from what I've heard, March sales are just as bad as February's to this point. Only a price drop might help, but a) I don't know if Sony can afford it and b) I don't know how much still having a $500 system is going to help as the premium is what folks think they want.
IMO, the DS and the Wii are the next-gen leaders by a fairly large margin. 360 may have the installed base, but the Wii has ALL of the momentum and could pass the 360 by the end of the year easily. Things can change, but I don't see how Sony being able to significantly better their competitive issues in 2007 and just hope they can stay in the Wii & 360's rear view mirror.