I gave a lecture on Picviz during the Usenix Workshop on the Analysis of System Logs (WASL 2008).
My slides 'Picviz: finding a needle in a haystack' are available right here.
I also ran for the Cray log analysis contest analysis. Slides of stuff I discovered are here.
I lost the contest by 1 vote only, but I was fighting against someone who knew a lot about Cray. He had in my opinion a better talk than mine, but I just started the contest after my morning lecture and I preferred talking with people during lunch than doing the contest ;-)
My discoveries + slides writing took me half an hour (thanks latex+beamer).