Due to some people asking about pdf apps. 6 @9 H8 d5 ?3 d' F/ M) K I use android apps " repligo reader "which has the highlight feature on playbook,but playbook has bugs 4 O/ }; [& r, m0 d( K...5 Z- `+ c$ o$ n* c) }, V" ?
also I use goodreader for ipad...