I play in person sporadically, I spend most of my time wishing I could get my group together more often. I use physical books when I can, pencils, paper (lots of paper when running Paranoia), pdfs (occasionally), and my brain. I don't use grids or minis, however I do sometimes draw crude maps. I've never run a campaign from a book and rarely use printed adventures. I run everything on the fly with minimal planning, though I'm working on developing good pre-planning skills.