[i]do you know if there is a way to ftp a folder and have the album unpublished by default?[/i]
No, you will have to upload via the admin interface if you want to have the option to do that.
[i]Also, is there any documentation on dynamic albums which can help me understand better how I can use it. So far, I understand that I run a search and create the album from the search result. [/i]
Correct.
[i]Do I need to have a seach page in my theme?[/i]
Without searchpage no search and no dynamic albums...
[i]If I don't expose any search box, is there any alternative way to run this search (instead of switching them)? I tried on my theme and it complained about the lack of the landing page (I guess).[/i]
No, but you could hide it for normal user by placing the search box code between ` if (!checkForPassword()) { <searchboxcode>}`then only you see it if logged in.
[i]What exactly is "searchable"? I tried to search some tags but it didn't return much. Sometimes also, I get albums. Can I search only pictures?[/i]
All textfields of Images and albums are searchable. If you don't find anything, you probably have set the options on the searchfields wrong.
[i]Last question, is there a way to expose metadata to local applications?[/i]
No, zenphoto does not add to the metadata, it is only able to read it and put it into the db. We recommend that you use an programm like Adobe Bridge or whatever to add the metadata to the images itself if you need that. Otherwise all added data goes into the db.
[i]Basically, what I'm trying to achieve is to have one folder where I keep all my pictures in a "timeline fashion" [/i]
As suggested above, do it viceversa, edit and organize the images on your computer and upload the folder via ftp.