i just received this link from the Community Manager of
http://www.splitcoaststampers.com/
Split Coast Stampers is one of our sister sites in the IB family.
i've cruised the hollyknott site briefly and verified that the photography tutuorial is, indeed, free. no need to sign up to read it. i stumbled across a few more interesting features of interest to quilters while i was there, too. :-)
http://hollyknott.com/stq/