Remote Usability Tests: Moderated and Unmoderated, by Amy Schade.
Your Guide to Online Research and Testing Tools, by Bartosz Mozyrko.
Remote Research Real Users, Real Time, Real Research By Nate Bolt & Tony Tulathimutte.
Beyond the Usability Lab: Conducting Large-scale Online User Experience Studies by William Albert, Thomas Tullis, Donna Tedesco.
Remotely Possible with Steve Krug and Tomer Sharon
Remote Research, The Talk, by Nate Bolt.
UX Lisbon, Remote Research Workshop, by Nate Bolt.