I'm want to start cranking out a new series of screencasts and need some ideas.  I don't really want to duplicate stuff that is already out there, so things like "Intro to Silverlight", "ASP.NET MVC Overview", etc. are pretty much out.  I also would like to do things that provide some immediate knowledge transfer and don't require the viewer to have a deep understanding of the topic to glean any benefit.  Some initial ideas are a few screencasts on Microsoft Unity and Velocity - not a ton of stuff out there and very useful technologies.  Topics that take two or three screencasts are fine as long as they all build on each other.  Anyone have any good ideas?