I have a handful of interests that play out in everything:
Industry disruptions: Whether contemporary ceramic studios or nonlinear editing, videogames, social networks, or consumer GPS...I like when circumstances are starting to change (usually, but not always, due to technology) and a new products/services can emerge from beyond the establishment. Pretty much all my jobs have been about this.
DIY: I like doing many creative tasks myself, rather than getting a professional, even knowing it'll usually be better if I get an expert. The birth of the Macintosh catalyzed this position; it was literally a prosthetic device that allowed me to do things that I otherwise would never have been able to handle: logos, graphics, books, bookkeeping, videos, start-ups...
Guerrilla Marketing: Part of DIY, coming up with interesting (and inexpensive) ways to stand-out in a crowded field is fun. From my college application to promoting 'Gardening' to PlaceBook... and an arry of early viral videos and content over the years.
Consumer Experiences: Or what was called "participatory retail," I enjoy making UX or physical spaces that are worthy. Increasingly people have expectations of bricks-and-mortar retail to be interesting and worth not being online for.
Brand Building: It's a hobby.
Archiving and Documenting: It's a pathology. I'm nostalgic, and always the guy journaling, documenting, photographing, organizing, saving. I collected stamps, then photographs. And all kinds of other ridiculous things.
Teaching: It's not enough to do something, it's also important to teach others. Obviously it's a family thing; we've all made different kinds of textbooks. My dad taught ophthalmologists, my brother screenwriters, my sister foster kids... For me it's the fastest way to get expertise in a topic.