If you're not on the Crossway mailing list, you might have missed the big announcement: a free, full-featured ESV iPhone App. I've been playing around with it for a little while, and so far I'm impressed. Navigation is simple and intuitive. You can select passages and click Details to see cross references and add your own notes. If you're already using the ESV Study Bible software from Olive Tree, I'm not sure this will replace it ... but for those of you looking for the text of the ESV in an elegant, easy-to-use format, the new iPhone application fits the bill.