Add a template to NextGEN Gallery that provides multiple-file downloads for trade/media galleries. NextGEN Gallery was one of the best gallery plugins for WordPress because it was very flexible and had a nice, simple admin. This plugin adds a new gallery template that lets you select multiple images from the gallery to be downloaded as a ZIP archive.
This plugin is targeted at creating “Trade/Media” areas on websites, allowing journalists to easily download multiple product images. It’s apparently very popular with photographers too.