Pearson's strategic investment in NOOK Media will accelerate customer access to digital content by pairing its leading expertise in online learning with NOOK Media's expertise in online distribution and customer service.

ENGADGET: Pearson buys a small stake in Nook Media, wants a fast track for digital education

Since then there has been a rush to bring on more partners and raise more funds to perfect the technically tricky art of pairing a digital signal with the existing analog signals while meeting strict FCC requirements.

FORBES: Big Audio Dynamite

New for 2013 is iPhone Siri digital assistant control and automatic iPhone Bluetooth pairing on all built-in Bluetooth models.

ENGADGET: Kenwood announces four new in-car multimedia receivers: connects through Bluetooth to most smartphones