Anything by Joel Rosenberg, Stephen Brust, or Dennis McKiernan - Oh Yeah, and Isaac Asimov and Heinlein.
Lately I've really gotten into John Scalzi, and my favorite new author is Brent Weeks. In love with Ann Leckie's universe.
Movies: Blade Runner and Anything directed by Tarantino, Burton, or Rodriguez
Music: Nerd Rock (Moxy Fruvous), Classic Rock (Tull, Skynyrd, etc.), Country, Blues, 80s Rock, Irish Folk Tunes
Foods: Spicy, spicy Mexican and Anything well prepared and presented
That might seem like a cop-out, but I really am interested in everything. I might spend an evening musing about epistemoloy or trying to evaluate tomorrow's pitching matchup. I could be considering the broad effects of concealed carry laws or poker probabilities or pretty girls. I just tend to think (all the time). It doesn't matter much to me what the current train of thought might be. I just want to ride that train.