I just moved into a new apartment, and have been sorting through moving boxes.
Half of them have been unopened for almost 3 years. Most of them have books in them.
While almost all of them are keepers, there's a few that I bought on a whim, and never read, or others that are borderline beach/airport books, but not (think Fever Pitch, The Alienist, etc).
I'm tempted to leave them on the street, for people to take. Otherwise, I'll toss them, but that feels wrong.