Is there no other themes available? There is almost NO development on themes or am i missing some info...????

All known themes are listed here: http://www.zenphoto.org/theme/
Yes, we could use more good themes but someone has to do them. Making good complete general usable themes (and maintaining them!) is quite some work as you hopefully know.

We as the Zenphoto team concentrate on the CMS itself which costs a lot of time (we are not paid for!) and have really not time to do lots of great themes as well (although I am planning to do one or two but don't find the time).

That said, feel free to contribute and maintain a theme. It is up to users like you as part of the Zenphoto community to raise the number of themes. You find info about that on the "Get involved" link on the top right of our site.

thanks for the feedback.