I have created and used a scenario for a small usability session I’ve run with 9 users. The scenario is available here http://design.xwiki.org/xwiki/bin/view/Proposal/UsabilityScenario4
The task completion is available here http://design.xwiki.org/xwiki/bin/view/Proposal/UsabilityScenario4TaskStatus
and some conclusions, issues reported back to the development team presented here http://design.xwiki.org/xwiki/bin/download/Proposal/UsabilityScenario4Report/UsabilityReportScenario4.pdf
Not sure is the best scenario or the most successful / relevant, but there were some interesting results 