"Nintendo now says it's sold 11 million units of the DS worldwide"
Isn't the actual figure over 30m, since the 10m sales mark has been reached in 3 territories?
Europe:
http://www.gamesindustry.biz/content_page.php?aid=22349
North America:
http://www.totalvideogames.com/news/Europe_Beats_North_America_In_DS_Sales_Race_11193_5409_0.htm
Japan:
http://www.mcvuk.com/news/26975/DS-Lite-sales-hit-10m-in-Japan

Mario VS DK 2 March of the Mini's is my recommendation. Its not a real time shooter or a real time racing but the level editor really gets your creative juices flowing and is an outlet for that part of you.