I found an Upcoming event posting[1] that indicates this was given as a talk at PARC on May 4, 2005. There are draft notes at the bottom so I'm not certain if

I found an Upcoming event posting[1] that indicates this was given as a talk at PARC on May 4, 2005. There are draft notes at the bottom so I'm not certain if this was the final version. [1] http://upcoming.yahoo.com/event/18619/ http://upcoming.yahoo.com/event/18619/