hello

proposal for improvement:

allow search by tag with multi criteria (3 key words for exemple)
when you select a tag, zenphoto returns the list of photos concerned by this key word.
the idea : zenphoto shows a tag cloud with the list of the related tags (all other key words present on the concerned photos).
in the same way, zenphoto shows a tag cloud of the list of the related tags with the 2 key words.
last, you can suppress any of the key words.

is it a good idea ?
is it possible in a next release ?

This is how the search object works. All you need to do is collect the combined set of tags from the images returned. Then you can do what you want with them.