I’ve been using (and loving) iStockPhoto for ages and now even more since I’ve been working with Lauren Deane Evans and seeing how she pulls such different images out of there than I would, I love it even more. They just have so much content there that if three people picked images under the same topic, they’d be three different groups with little overlap.
Lauren is often telling me that the difference in the look of many websites is the photography and after seeing what she chooses, I believe her.
Tip: check out their illustrations as well as photos, some great work in there.
