The Orange County, California group is run through the Huntington Beach community. So if you go to the website do a search for "Huntington Beach" and click onFollow the directions found in the next box and you will be directed to the groups Yahoo page. Click on "Join This Group" in the upper right. You will need a Yahoo ID to join. Once signed up you will be able to get notifications about all the items being offered.
There are a few rules within the group such as making sure you format your postings correctly and how often you can make a "wanted" post. The moderator will send you an email with the details of all this when you first sign up.
There are a lot of different things posted including (just today) a TV with VCR, computer, laser printer, digital camera, and workout items. This is especially great for moms because I notice that there are tons of baby items offered daily (just today I saw a Leap Frog learning table).
So get out there and save the planet and get some free stuff while your at it!