[Koha] List of Koha libraries and/or their OPACs

Hi. I've been poking around for some library OPACs to study what is possible with Koha but haven't had much luck. I'd like to steal some ideas for developing our own OPAC. Could someone point me to such a list? Also, any other suggestions or OPAC development tools would be much appreciated. Thanks much! --Jim Maroon