UPDATE: These (and other) videos are now on Channel 9 as part of the PerfView Tutorial Series.
Here I add another 2 videos to the collecition. The should be unpacked into the same directory as the first 3 (that is the perfViewVideos directory beside the PerfView.exe file).
The first of these decribes the powerful grouping and folding features that I think set this tool apart from any other performance tool I have used.
The second video shows the 'drill into' feature, that allows you to create 'subInvestigations' of just some of the samples of the original trace. I use this feature all the time. It is very valuable.