Not yet legal history, but certainly historic: many news outlets are now reporting that President Obama's Supreme Court pick will be announced today: Judge Sonia Sotomayor.
The NY Times has links to some of Judge Sotomayor's previous opinions.
Tom Goldstein discusses the politics of the nomination on SCOTUS Blog.
Jack Balkin weighs in on Balkinization.
And for those interested, I have more to say here.