Note: In order to transfer credits from your accounts, you will have to have used your initial credits for the site you are transferring from. This is because the initial free credits we give are gifts to encourage members to try out the site. We do not intend for the startup credits to be used on our other sites. And in order to transfer your initial free SwapaCD credit that you earn for posting 10 CDs to your account, you will need to deposit SwapaCD Money to your account.
PBS credits will be transferred 1:1 to SwapaCD (1 PBS credit = 1 SwapaCD credit) or SwapaDVD, and vice versa.
So if you want to give someone else book credits from your SwapaCD account, you will need to transfer the credits between YOUR accounts on SwapaCD and PBS, and then make the transfer to the other person's PBS account from your PBS account.