Yes, I am obsessed. I got three great DS games for Christmas (Polarium, Bust-a-Move DS and Meteos) and am totally hooked.
We bought the DS for Nintendogs, which is a lame approximation of Mainichi Nekoyoubi ("Every day is cat day") from Japan, published about 7 years ago. I never really warmed to Nintendogs -- maybe because your dog is always a puppy, and I've really been into the whole girly, "young animal" cult.
Anyway, Meteos came into my life like a breath of fresh air! I don't know why I like it so much, but I guess I finally get the thrill that Tetris devotees have been feeling for years. If you haven't tried Meteos yet, you should check it out.
It's so good that it almost eclipses my favorite DS game ever, Trauma Center. Now there's a game! How can you not love an operation game where you have to remove broken glass from someone's epidermis?