In response about the discussion on wikien-l about fair use and placeholder images for biographies (and other things?) I have written a new tool, WatchFlickr.
Given a category (at selectable depth), it retrieves all articles in that category, checks if it lacks an image, and if so, searches Flickr for relevant CC-BY and CC-BY-SA images. It shows found flickr thumbnails, links to the wikipedia and flickr page, and to Flominator's Flinfo tool.
Not that due toolserver problems, several wikipedias, notably en, are not available to search right now. German wikipedia works, though, in case you want to test.
URL: http://tools.wikimedia.de/~magnus/watchflickr.php
I have already found, uploaded, and used about a dozen "celebrity" images, both adding a new image and (on en.wp) replacing fair use and placeholder images.
Cheers, Magnus