First off, let me say that zenphoto kicks ass, and is "almost" exactly what I'm looking for in a photo gallery app.
However, the one feature it's missing is quite a biggy for me. No sub-albums.
I used to use SPG which was in essence a cut down version of ZP. It allowed sub albums which were auto recognised, so I know it's possible to do. I therefore wonder why it's not currently in ZP.
I appreciate that there might be techincal reasons why ZP doesn't do this, but there must be some sort of way of categorising albums (whether it's using tags, categories, or sub folders).