Another
for the Nerf cases... when I got my dd's their DS's for Christmas, I had those cases on them the second they opened up their presents. They've protected the nintendos many times over, and IMO, it makes them easier to hold since it gives them more "bulk".
This is the one I got for my younger dd... bright pink, lol.. found it at Target.. http://www.toysrus.com/product/index.jsp?productId=3144201

This is the one I got for my younger dd... bright pink, lol.. found it at Target.. http://www.toysrus.com/product/index.jsp?productId=3144201