Wow. You gotta admit it, this is a pretty impressive study Bible. Check out JT's post for the links, or poke around the ESV Study Bible site itself.
Amongst the many names that caught my eye was David Black's, who has written an article for this publication entitled The Original Languages of the Bible: Greek. As you might recall, I've got his Greek grammar, which is top-notch. Articles by Daniel Wallace, Darrell Bock, Walter Kaiser, John Piper, David Powlison, and Andreas Kostenberger also look promising.