An eReader with a touch-screen has no excuse not to have basic PDA functions (ToDo, Calendar, Notes, Drawing.) It's the size of a physical planner, the software doesn't demand massive CPU usage and it means getting rid of another device in your pocket or bag. It's also another excuse to carry the eReader around!
I may have to get an ASUS Tablet (or Note.)
EDIT: @Ulli: I added it to the thread, let's see if it gets shot down...