I am new to ZenPhoto and I love it...

It is soooo neat and clean!

Well this is exactly the interface I was looking for..

I am surprised to see that there is no feature in ZenPhoto where user can register and login to upload photos..?

Neither I had seen such plugin available for ZenPhoto..?

Is there any particular reason behind this..

Can anyone help in implementation of this feature..?

Zenphoto supports only prefdefined user accounts, but maybe this helps: http://www.zenphoto.org/support/topic.php?id=2716&replies=2#post-16213