In the new online journal International Journal of Internet Research Ethics, there is an article on online interviewing – Small Talk by Annette Markham.
The article can be accessed free at:
http://www.uwm.edu/Dept/SOIS/cipr/ijire/issue_1.1.html
I heard about it on Mary Helen Ward’s blog “Faultlines”.
A comprehensive list of all Markham’s publications can be found on her website: