Price cut definitly helped the 360 well.
PS3 sales are still good too, to put things in perspective at this point in its life (18 months or so after it's release) the PS2 was averaging 70k/week in Others.
100k a week is nothing to spit at during it's first 4 years in Others, based on VGChartz data the PS2 had exactly 3 weeks where it sold over 100k/week ( they were around August-sept 2002) outside of the October-January holyday period...
This week all 3 consoles are selling more than the PS2 was at the same time, that is no small feat...