If you are a Drupal user and would like to learn more about Webforms, then this new book from Packt Publishing may be a great...
TookaPic has over 67,000 images, and add images to their collection daily. There is a large set of free images and an option to pay a monthly fee to access the entire collection.
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Main site: Tookapic.com
Free images: Tookapic.com (Free)
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Stock Photography
There are a lot of great images to choose from through Burst. There is a consistency to the quality of images that may be interesting.