Here they come, the seasonal wave of fat catalogs overflowing your mailbox!
You will almost certainly get some from companies you've never done business with and have no interest in doing business with. Don't just toss these.
Put them by the phone and then when you're doing some task that allows for having a phone by your ear (I do this in the kitchen usually), call them up and ask to be removed from their mailing list.
Yes, it's kind of a pain to make the call, but it really does help reduce the flow of junk mail once you've been doing this for a while. I get far less than I used to.