Two weeks ago, Thomas Hawk posted a blog entry about a new tool called FlickrLeech. This site, which I don't believe is associated with either Flickr or Yahoo!, uses the Flickr API to search for keywords, and then display nothing but thumbnails, 200 at a time, on your screen. You can then quickly eyeball the images that you're in. You can literally search through a few thousand images per minute.
Great for night photographers! Try entering the search phrases "nocturnes" into the FlickrLeech tool bar.