Free Access to the Online ESV Student Study Bible

From the Crossway blog:

The ESV Student Study Bible was simultaneously published in print and online formats. The Online Student Study Bible is hosted through ESVBible.org and functions as a study module, similar to the formats of the ESV Online Study Bible and the Online Literary Study Bible. With notes, book introductions, maps, and specially written articles, it's a portable, easy-to-use tool to compliment your free ESVBible.org account.

Normally on sale for $9.99,  you can unlock the Online Student Study Bible for free by sharing it with five friends. Here's how:

Log in to your ESVbible.org account (or register for free)
Click on the add content button at the top
Click on "Student Study Bible Notes"
Click on the "Invite 5 friends" link
Submit 5 e-mail addresses and the Student Study Bible notes and resources will be unlocked – use and enjoy!