County "Freecycle" Program

Just stumbled across LAcoMAX, a materials exchange website operated by the Los Angeles County Dept. of Public Works. It's open to individuals, nonprofits, and businesses and works much like a Freecycle group. Let's say your business is replacing some older computers that are still quite serviceable. You can either look for an organization that is seeking such items for donation or post that you have it available. If a nonprofit gets it, you get the write-off!

Here's a sample Available! posting.

Available!! Computer tower in Area 1 ( North Hollywood, CA ).
Category: ELECTRONICS
This listing is for schools/nonprofits only.
Description: 2001 Dell computer, still workable, but outdated.

I've removed the info about contacting the poster for security purposes. The nice thing about the site is you can search by region within LA County to reduce getting a bunch of materials very far away. You can also select what type of materials you are interested in. Categories range from electronics and durable goods to construction materials and textiles.