Today I gave away a DVD. This was easy as I was given it and didn't need to see it again. The nice thing was giving it away at a coffee morning to someone I knew.
Freecycle is a great way to give things away, and there's the opportunity to get things for free if you need them. It prevents things going into landfill as well. Freegle is an identical site made from ex-Freecycle moderators (don't ask me about the politics behind that!) so between the two you can usually find a group local to you, which is useful for picking things up.