http://lumberyard.altervista.org/doku.php?id=graphic:image_based_lighting_setup very wip tutorial on Image-based lighting. Feel free to edit/iterate and please give your feedback.
Here are some free HDRI resources:
thanks, I have to check the licenses to see one I can release with the scene files as most freebies have Non-transferable licenses.
The second link seems to be ok with CC-BY-NC-SA license.