Wii - 450k
DS - 400k
Xbox 360 - 325k
PSP - 225k
PS2 - 190k
PS3 - 125k
In unrelated news, NPD has changed it's mind and is going to release monthly hardware data indefnitely.
http://www.gamedaily.com/articles/news/npd-to-continue-providing-hardware-data/18499/