Does Seymour Duncan only make pickups?

Along with the huge range of pickups, Seymour Duncan also builds some highly regarded pedals such as the 805 overdrive and the Vapour Trail delay. Not only that, Seymour Duncan builds some of the best aftermarket poweramps on the market with the Powerstage line. They also provide parts such as onboard active electronics and their own potentiometers such as the Yngwie Speed Pot.

What are the most popular Seymour Duncan pickups?

Depending on what you're looking for there is a huge variety of pickups, however you can't mention Seymour Duncan without mentioning classic models such as the JB, the '59, the Hot Rails Strat, or the Quarter Pounder.