Well wouldn't you know it - just days after my last post lamenting the lack of options for capturing screencasts, a new tool called Reflector has been released that allows the iPad2 and iPhone4S to stream to any Mac running OSX Lion (pretty much just like airplay on AppleTV). It's $15 for a single-user license.
Over on Digital Inspiration, Amit does a nice job of wrapping up all your options to date, including examples of content produced via each method.
Stay tuned for some library-related iOS screencasts!