Primarily, sciences, philosophy, Zen, psychology, some forms of comedy.
People of any age, race, and orientation, preferably with a few common interests.
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Some things from most genres have caught the interest, except punk or death metal. Upbeat music has generally been preferred. Examples of "interesting" artists within the vaguely defined genre of pop/rock include (in no particular order): Vertical Horizon, Yes, Moby, Kansas, Depeche Mode, Duran Duran, New Order, Erasure, Nightwish, Kamelot, Roxette, Smash Mouth, Aqua, Ace of Base, Real McCoy, Genesis, and Mr. Mister. Artists of other genres include Cusco, Marc Antoine, Praful, Suzanne Ciani, Chris Spheeris, Craig Chaquico, 3rd Force, David Benoit, Enigma, Mannheim Steamroller, The Rippingtons, Enya, Keiko Matsui, Yanni, Bach, Mozart, Beethoven, Chopin, Rachmaninoff, Tchaikovsky, Scott Joplin, and Weird Al Yankovic. :)
Star Trek series, Star Wars series, Dune, Matrix series, Lord of the Rings series, Tron, Harry Potter series, Princess Bride, Monty Python's Holy Grail, I Robot, Indiana Jones series, Hunt for Red October, Forrest Gump, and pretty much anything that was more than 90% 3D computer-generated graphics.
Lately, Stargate SG-1, Stargate Atlantis, Monk, Life, Mythbusters, Numb3rs, House, Psych, Heroes, Chuck, and The Universe. In the past, Star Treks TNG, DS9, and Voyager, Farscape, Frasier, Friends, Seinfeld, The Simpsons, Whose Line Is It Anyway, the occasional documentary, and several others that slip the mind. Several anime series, including: Ghost in the Shell, Trigun, Cowboy Bebop, Naruto, Escaflowne, Tenchi Muyo, Neon Genesis Evangelion, and probably others that have been unintentionally left out - all series preferred with original Japanese voice acting and English subtitles.
Non-fiction: Zen and the Art of Motorcycle Maintenance by Robert M. Pirsig, Demon Haunted World by Carl Sagan, The Singularity is Near by Ray Kurzweil. Fiction: multiple books by Douglas Adams, Orson Scott Card, Isaac Asimov, Grant Naylor, Arthur C. Clarke, Robert A. Heinlein, Frank Herbert and his son, and probably more than one other author that didn't bubble up from memory at the time of writing this.