I constantly have things in my home that need to go other places. I have borrowed items that need to go back to their owners, books to go to the library, plastic bags to recycle, egg cartons to my uncle who has chickens, magazines to donate, etc.
The best thing I have found to do is to immediately stick those things out in my van when I find them. It gets them out of the house and when I go somewhere or see someone, those things are right there with me to get rid of. No more forgetting them at home on the counter and wishing I had them.