Remote Online Usability Testing: Why, How, and When to Use It
http://www.boxesandarrows.com/archives/remote_online_usability_testing_why_how_and_when_to_use_it.php

Gough, Dabney and Holly Phillips
Boxes and Arrows
2003

Abstract:

Traditional, one-on-one usability testing is a great technique for uncovering usability issues on a website. Unfortunately, in-person usability testing isn't always feasible due to tight schedules, tight budgets, and elusive target users. So what's a usability crusader to do when in-person usability testing is impossible?