Interesting discussion! :-)
I think WordPress AND ZenPhoto together may be much more powerful than on their own... So better and easier (possible) integration between them would be great
See, WordPress is one of the best blog platforms of today, very well developed, going in a good direction (I hope so;-) and quite popular, with tons of plugins for it, some even make whole websites with WP, using it as a CMS and media engine, not only a blog!
On the other hand, ZenPhoto- relatively new software to me, which I have found by accident a few days ago -- looks very promising in relation to publishing and organizing photos in a nice, user-friendly (and site-owner friendly;-) way! This is one of the reasons I am so much interested in ZenPhoto these days and already started 'hacking' one of its themes to match 100% a website which I currently design...
So, combine them both, and you get quite a powerful package! :-) I wouldn't get rid of my WP blog just to replace it with Zen, but, on the other hand, I would be very happy if I could add ZenPhoto to my website and integrate them in an invisible manner. Somewhere in the future -- I still don't have enough free time for me -- but I plan it
Hope my mumblings weren't too incoherent... ;-)