Wow, this sure came out of left field. TiVo has applied for a patent allowing customization of remotes and PVRs based on personalized preferences provided via RFID. They describe a variety of scenarios and hardware such as providing customized hotel television viewing and adopting the technology within mobile multimedia devices. No telling when or if this will ever make it to market.
US Patent Application says: A multimedia mobile personalization system provides a remote control that detects a user’s electronic tag, e.g. an RFID tag. The remote control notifies a multimedia device of the user’s identity. The multimedia devices tailors it operations to the user’s preferences stored locally. Multimedia content such as broadcast or recorded television programs, music play lists, and the like could be sorted, displayed, or restricted, depending on the user identifier.