Judge Sonia Sotomayor of the Second Circuit.
Some critical reviews:
"Not that smart and kind of a bully on the bench"
She believes that the Court of Appeals is where "policy is made."
She has stated that a Hispanic woman should use her own experiences as a woman of color to make her decisions.
I note those articles because it seems as if there has already been a white-wash of coverage as to why this nomination is so wonderful. From my perspective, she doesn't have any bad decisions to latch on to, but I think her multiple public speaking events will bite her. I'd put money down that she is easily confirmed, which are two scary words to use in conjunction with an unelected self-described "policy-maker."
Here's an interesting story behind the story: Looks like Obama's people have been updating the heck out of Sotomayor's Wikipedia page. Look at all of the edits for May 26 compared to the previous history. These edits were clearly aimed at painting her as a centrist supported by both parties.