Actually.. that's not quite right..
It's true that 360 outsold PS3, but the DS was the top selling system. With the PS2 at number two, and the Wii at number 3.
http://wii.ign.com/articles/782/782163p1.html
April 19, 2007 - According to new monthly software sales data released by the NPD Group, Nintendo's DS handheld and Wii console were the number-one and number-three best-selling videogame systems for the month of March. Nintendo's machines have owned the charts for the last three months. More than 500,000 people bought a DS and 260,000 a Wii in March.
Microsoft's Xbox 360 console sold almost 200,000 units in March. PSP managed 180,000 units and PlayStation 3 continued to lag behind all others with sales of 130,000.
1. Nintendo DS - 500,000+ Units
2. Sony Playstation 2 - 290,000 Units
3. Nintendo Wii - 260,000 Units
4. Microsoft Xbox 360 - 200,000 Units
5. Sony Playstation Portable - 180,000 Units
6. Sony Playstation 3 - 130,000 Units