I'm with you. I like screencasts for getting started with a new tool but once I'm up and running I tend to reach for in-depth written documentation or reference

I'm with you. I like screencasts for getting started with a new tool but once I'm up and running I tend to reach for in-depth written documentation or reference materials. But, this makes screencasts really valuable IMO. When you have an hour to evaluate something a screencast seems more useful than a massive book.