With the much-publicized hardware shortage, how did the Xbox 360 launch compare with other recent console launches?

First Day Sales (US Figures, within the first 24 hours)

Sega Dreamcast, 225,000 [source, Wikipedia]

Playstation 2, 510,000 [source, Wikipedia]

Xbox, 400,000 (approximate, shipping numbers) [source, Gamespot]

PSP, unknown

Nintendo DS, unknown (550,000 were shipped, and just over 500,000 of those sold through in the first week) [source, Wikipedia]

Xbox 360, 450,000 (approximate, shipping numbers, assumed sellout) [source, Reuters Yahoo!]