What is the best-selling handheld gaming device of all time?

Nintendo DS

Which TV show featured Taylor Swift as a guest star portraying a character called Haley Jones? Who portrayed Julia Child in the 2009 film "Julie & Julia"? Which film follows a pig who dreams of herding sheep? Who was the lead actress in the film "Clueless"? Which cult classic RPG developed by Ion Storm is centered around a nano-augmented agent named JC Denton?