From the NPD thread, thought it deserved its own thread, numbers are courtesy of a poster at NeoGaf, formatting of this table is a little janky, but it should work:
This is the 3DS vs. the PSP and DS at the same respective points in their life cycle.
3DS 2014 PSP 2008 NDS 2008
January 97 230 251
February 153 243 587
March 159 297 698
April 106 193 415
May 97 182 452
June 152 337 783
July 108 222 608
August 91 253 518
September 141 238 537
October 138 193 491
November 421 1570
December 1020 3040
Through
October 1242 2388 5340
Total 3829 9950
Now I understand not being able to touch the original DS, but selling at half the rate of the PSP?! Smash Brothers doesn't even appear to have given the 3DS any type of boost for October.