I really haven't studied up on Judge Sotomayor, so there's nothing I can tell you that you can't find somewhere else. Which is why I'm sharing this NY Times link: "Obama Chooses Sotomayor for Supreme Court Nominee."
What I will say is that I like this pick. I like the added diversity of enthnicity, background, and perspective. I also like what I've read about the decisions she's made on the circuit court. The conservative poo-poo by Wendy E Long in the article is just ridiculous and nonsensical; hense, why I'm calling it poo-poo.