JoeRock's great site has a lot of logos...but sadly a lot of the ones you see here are not on any sites.
enuttage used to have the logo gallery with some great logos, but it is not available anymore...at least the last time I tried it...this was a great loss to the OOTPB community. I sent him a pm, but got no reply.
Just go through each thread on this forum and you can find a lot of fine logos...but it is time consuming to do it, but very productive.
http://www.ootpdownloadcenter.com/