Hi Rtouch
try
Stock Photography: Search Royalty Free Images & Photos | iStockphoto.com this is not free, but is very very cheep..
and the best thing is I know this site is very dilligent in protecting rights.. They expect their contributers to provide photo id, ( I know that this is no guarantee), and are very specific and strictly empathise that images submited are the work of the contributer.
They are also very tight on what they will and wont accept.. They certainly wont accept poor quality images..
an added bonus is they also expect images submitted with people to have included a full model release agreement.
You are also able to create an account and offer your own images up in the hope that you can make enough credits to spend on other images.