A great pick, from what I've read. I read and then skimmed the Wikipedia piece on him, and like his decisions and how he came to them. I also read through most of the famous "Menorah" display case (thanks Chaim), and there, too, I liked what he wrote.
Michelle Malkin has a roundup of dozens of bloggers on Alito - they know a lot more than I do, and they all think he's a great choice. Even DovBear thinks it's a good one, for now at least.
Technorati tags: Alito, SCOTUS.