From the ESV blog (last month), here are instructions on how to add an ESV link to the home screen of an iPhone:
- Make sure you’re running the latest version of the iPhone firmware. (On your iPhone, go to Settings > General > About. The “Version” should be 1.1.4.) If you’re not running the latest version, sync your iPhone with iTunes (which may also require updating—use Help > Check for Updates) and install the latest version.
- Visit www.esv.org/mobile using Safari on your iPhone.
- Press the + sign at the bottom of the iPhone screen.
- Press the “Add to Home Screen” button.
- (Optional.) Change the name from “ESV Bible” if you want.
- Press the “Add” button at the top of the screen.
Update: The NET Bible (a translation I would commend) also has an iPhone site.