Possible Clues:

• One who's always on the phone?
• "Memories of the Future" author Hustvedt
• Portable speaker?
• Tireless, unpaid assistant
• Smart talker on an iPhone?
• Assistant that says "OK, here's what I found"
• Digital aide to millions
• Tech debut of 2011
• Phony personality?
• Apple's counterpart of 3-Down