Here's a simple screencast I created recently to help explain the features of the desktop version of The Bakersfield Californian e-edition.
I used the free version of Screenr to capture a 5-minute screencast. There are a few sections where audio and video is clipped but those burps don't dilute the overall message. For a free product, the simple Screenr tools deliver pretty good results.
I'd like to do a screencast for our iPad app but I'm unaware of integrated software that captures iPad movements. All I've seen are videos shot from above the screen, an angle that while it captures hand movements, is hard to get right because of screen glare. Please let me know if you're aware of a screencast tool that works on iPad; it seems to be one of those "holy grail" products that no one has been able to produce.