I'm taking pictures of my room, my apartment, my neighborhood, some of my friends and, eventually, my workplace too. It's not that I fear that I won't remember what everything looks like, it's just that I think it'll be awhile (if ever) before friends or family members of mine come out to visit so I'm taking pictures so they'll have images to put to descriptions I give them. It still feels odd doing it though.
Honestly, I've never been away from the East Coast for this long before, and once my parents move to Arizona, I think it'll be even longer stretches between visits. Boston feels like it's another lifetime away.