Since we've moved, we've used the opportunity to place every extraneous piece of material in our basement in a pile and are dedicated to going through it, box by box, sorting and giving things away.
Although, you can't get a charitable deduction for items given to people, I've been using Columbus' local section of FreeCycle in which you post something like Offer: 8,000 Btu A/C - zip code. Then you wait for 8 million people to email you wanting your stuff. Then, sift through the list (supposed to do it chronologically, FCFS), start selecting the lucky recipient and make pickup arrangements on the side.
I did this a few days ago for this actual A/C unit and, after one misunderstanding, found a potential recipient. When they came to pick up the unit, it turned out to be friends from work!
Got stuff to get rid of that you don't want to haul? Give FreeCycleColumbus a shot.