I recently discovered that the ESV underwent a revision in 2007. While there is not a note indicating such on the spine or cover of these new Bibles, the Copyright page of the newest editions does indicate ESV Text Edition: 2007.
If you’re interested in comparing the original (2001) with the revision, check out…
…via Rick Mansfield.
If you use the Libronix Digital Library System (which comes free on CD with the purchase of most ESV bibles) as a way to integrate the ESV text into a word processor or PowerPoint, you can go here to update your software to the 2007 edition.
Also, I’ve heard some ESV users ask about the possibility of a Study Bible. That wait is over in October 2008. The website already provides a wealth of information and sample pages, so check it out if you’re so inclined.