Meet the Sony DPT-RP1 Digital Paper: a 13.3″ e-paper device with WiFi and Bluetooth that lets you view, annotate and share documents conveniently. It is as thick as about 30 sheets of paper and has a pen for interacting with documents. The device has storage space for up to 10000 PDF files.
The e-reader has up to 3 weeks of battery life. It comes with PC/Mac app. You can protect your documents using password protection and 128-bit encryption.