I've created a frontend and backend for selecting freely licensed photos from Flickr to be uploaded to the Commons:
http://commons.wikimedia.org/wiki/User:FlickrLickr
Using the Flickr API, I am building a database of free photos from Flickr, and users can apply for access to the frontend to review slices of 1,000 photos each. After a slice is finished, I review it and run the upload bot to upload the selected photos to the Commons. See the above page for more information.
There are currently almost half a million CC-BY photos on Flickr, and new ones are uploaded every day. I hope that a systematic effort to review these photos will greatly enrich the Commons.
Please help by applying for access to a slice of Flickr. Best send me a private email with a link to your username so I can look at your past contributions.
Best,
Erik