I gave a talk today at SCALE 4X describing how to use DTrace to understand Linux applications by using BrandZ. I admit I was a little leery about how a talk about a Solaris feature would go over at a Linux conference, but it was very well received. Here's my slide deck:
For more, check out my blog post on the subject.
Sorry, it wasn't video taped. The talks were audio recorded, but even that isn't going to help much (except when I was DTracing xmms as it played "Super Freak"). The demos I gave were very roughly a concatenation of what Bryan wrote about demo'ing DTrace and what I wrote about DTrace for Linux.