From the Crossway news release:
Crossway is pleased to make the highly acclaimed ESV Online Study Bible available free to anyone, anywhere, for a limited time beginning today, March 2, 2009. First published October 15, 2008, the ESV Online Study Bible has been available, until now, exclusively to those who have purchased the print edition.
Created to help people understand the Bible in a deeper way, the ESV Study Bible, with 2,752 pages of notes and resources, is the most comprehensive study Bible ever published. In addition to the features found in the print edition, the ESV Online Study Bible provides numerous interactive features enabling readers to:
For full access and free trial use of these features for one month, visit www.esvstudybible.org/online. Simply create a login and password. Email information will not be shared, nor will there be any obligation to purchase. Free trial offer expires March 31, 2009.
You can just create an account to get the free trial.
Read the whole news release.