Is there a demo website available using Wordpress+Zenphoto?
I want to look at them.

www.zenphoto.org would be one. You can easily tell what is what...

My website at bryanbrazil.com is also one. It uses the Wordpress plugins ZenphotoPress and ZENpressed. I also have the latest photos from Zenphoto listed in my Wordpress footer.

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Is there a demo website available using Wordpress+Zenphoto?
I want to look at them.

If you like integrate Wordpress and Zenphoto this topic is great for you http://tech.einaregilsson.com/2007/08/06/integrating-zenphoto-into-wordpress/