normaly you have to pay to use site like this "Usenet Pictures 4 Free"
Currently they are indexing 1,242,879 pictures in 1,901 groups. As time goes by the collection will grow and so will the features available to you..
A lot of it is Adult content, but it saves you your bandwith downloading picture you dont want, when you can just view them with your web-browser.

If you know of any other sites like this please share