Stan reponds in the thread just referenced with this
“Trebor’s notions around immaterial labour certainly qualify here — collaborative media do obscure the free labour that goes into them. And also Wikis. Their collaborative veneer disguises the elitist participation in them.”
See Wikinomics discussion on iDC.
Also the discussion on the list about immaterial labor is very critcal as well. It starts in august 07 here: