I have a DS. It is blue and I love it.
I like having two screens. It's like having two windows with which to see into a world instead of one. Wow! Though sometimes it feels like one is a basement window that doesn't show much of anything. Or a skylight, I suppose.
My blue DS matches my blue Gameboy DS. Even though I have both, I still get usage out of the both of them. Sometimes the SP is more convienant. We all still have tons of fun together. They have totally out of control drunken parties though.
extensive research shows me there are tons of apps out there, that are awesome and sweet. There is a port for my favorite language in the universe for the DS and that alone gets me excited. Also, there is a drum machine program, so that in between games I can lay down some phat beats and freestyle with my homies. My DS is gangsta.
If you have a DS, make sure to tell it, "I love you" every single day. It helps the DS's self-esteem and ensures optimal gaming experiences.