Barnes & Noble this morning posted an upgraded version of its eReader app for the iPad (free, App Store) that brings it more in step with iBooks, other apps, and the features on some dedicated, LCD-based e-readers. Like the special control in Apple's iBooks app, the Barnes & Noble client can now tune the screen brightness itself instead of relying on the tablet's overall preferences. Its two-page layout has improved, and book syncing has also been accelerated.