Reading (duh), writing (theoretically), pens, flags, music (alternative, electronic, and classical mostly. K- and J-pop also welcome), languages and scripts, trains, astronomy, anime, assorted fandoms.
Also, a regret: not chatting a bit more with the cute cashier at the aforementioned Barnes & Noble. Numbers be darned, I just wish I'd said a bit more than "Please" and "Thank you"!