I've updated the first post with everyones posts and also added some more links
http://www.evermotion.org/?unfold_exclu ... =exclusive (Hdri sky collection)
http://www-users.cs.umn.edu/~mein/blend ... ure.html(A collection of texture plugins)
http://blenderartists.org/forum/archive ... 88549.html (The IOR settings for various different materials. the information is at the end of the 5th post)
Nismo