Constant learning. General Nerdery.
Science! in its various forms.
Comedy, music (just like everybody else, of course), movies (or "film," if you prefer, you pretentious bastard), politics, history, trivia...
Pink Floyd, Led Zeppelin, The Beatles, They Might Be Giants, Ben Folds [Five], early Bowie, Gorillaz/Deltron, Elliott Smith, Franz Ferdinand, Frank Zappa, Gnarls Barkley, Purple Rain-era Prince, Rolling Stones, Supergrass, Warren Zevon, the soundtrack to Katamari Damacy
Aaron Copland, esp. Appalachian Spring, Shostakovich's 5th Symphony, Sergei Rachmaninoff, Sibelius's 2nd Symphony, Beethoven's symphonies and piano sonatas, Holst's Planets (and, like a good dork, John Williams' Star Wars scores) Ennio Morricone's score from the Good the Bad & the Ugly,
The Empire Strikes Back, Pulp Fiction, Mulholland Drive, Magnolia, Dr. Strangelove, Hitchcock, the Godfather, LA Confidential, Airplane!, Ghostbusters, The Good the Bad & the Ugly, The Big Lebowski, The Manchurian Candidate, The Sweet Smell of Success, City of God, Aliens
Twin Peaks, Six Feet Under, Law & Order: Criminal Intent, The Venture Bros., Simpsons seasons 3-7, Mr. Show, the West Wing, Arrested Development, MST3K, The Sopranos, Chappelle's Show, Kids in the Hall, Futurama, I Love the x0s
The Amazing Adventures of Kavalier & Clay, Catch-22, Ficciones by Jorge Luis Borges, Orwell, The Godfather, pulpy old spy/scifi novels when I'm on vacation
(under construction, ill-considered, and stream-of-consciousness)
Fazlur Kahn, Michaelangelo, ...