If they are audio books -- a book being read aloud by a narrator -- then you'd post them here.  If they are music or comedy CDs, or CDs that are something other than an audio book, www.swapacd.com is the right place to list them.

Nothing can really be cross posted, what is allowed to be posted here can't be posted on the other sites. You can read the Help Centers on each one to see what is allowed but PBS is for audio books, SwapACD is for music or other non-book CDs. Things that are not a recording of a book being read aloud cannot be posted here and books cannot be posted there. Audiobooks are also not allowed on the DVD site.

Patty and Melanie for the info. 

I purchased swap money but found out I have to have credits to get what I want.  I don't have anything I want to list though so won't get credits.  I should have read the full instructions before purchasing. 

Audiolady, you can transfer credits between the 3 sites.  You don't necessarily have to trade on that site.

Go to the menu at the top of the PBS/swapacd/swapadvd site and choose Kiosk>>Transfer Credits and follow the instructions.

I post audiobooks and trade the credits over at swapacd and get audio cd's. Even when you count in the .50 cent audio cd "Insurance" it is still a good deal!

Thanks for the info Jennifer and Dave. 

It may be that nothing is technically cross-postable, but there are some CDs I've seen both places.