There are high quality video links just to the right of the right that you can click on (I mention that in the text below the video frame). I recommend the WMV version (it is the original).
To answer MagicAndre1981's question, I am a big fan of XPerf/WPA, and work with that team to make it better. If you are happy with WPA, certainly stick with it, it is a very powerful tool. I like to believe that most of the knowledge you learn in using one tool is applicable to the other.
As to why we have both, the simple answer is that XPerf had a codebase (originally completely unmanaged), and and a installed-base / client base (the OS guys), that make it evolve in a certain direction and at a certain rate. Historically it did not suppport managed code well, and adding extensions is harder than you would like. Originally the goal was simply to have a managed code interface to ETW data. However once you have this, you start wanting to explore better/different ways of presenting the data, which is the genesis of PerfView.
For what it is worth...