powered by postgresql

I have 90% sold yet-another-bookstore-site which will contain 1.2 million books.  The customer just wants to see one or
twosites 
running Postgresql.

Please can anyone who has developed (or knows about) a good looking Postgresql driven site please let me know (just the
URLwill 
do).

I know this question has been asked before.  I am very happy to collate responses into a "Which sites are powered by
Postgresql?"
addition to the FAQ.

Thanks for your help.

timj
tim@hoop.co.uk