I have been using SXC.hu for a number of years, and it has been pretty good. However, it hasn’t changed much in the last few years. There isn’t a ton of new images and design is starting to get a little dated. A number of years ago it got bought out by a large stock photo company, and put ads of there and are using it to drive traffic to their site.
I had a conversation with a contributor of SXC.hu that told me about RGBStock which is a community based project that is providing images for free.
Our vision is to build the best free stock image site on the web. We are dedicated to making high quality images available to those who cannot afford to pay for them.