Though it's been requested before, let me add my voice to those asking for a batch download of previews. We often audition dozens of images and music for our projects.
We are currently working on a motion graphics project with potentially dozens of images. We generally need to review 2-3X as many images as we use. That is a lot of tedious back-and-forth. It's something that really should be automated. The process is frustrating and makes me think twice about using stock footage in my projects.