Thanks for asking! We are working on an Android version of the KnittingHelp video reference app. However, we have run into some roadblocks with handling the video across the different android devices and versions. So the project is taking longer than we anticipated as we figure out ways to work through the roadblocks. I don't have a timeline yet, but if you want to stay up to date with the progress and be notified of the release, the easiest way would be to follow our facebook page or twitter account.
I know there will be some people asking about Blackberry, Windows Phone, Kindle, etc. I'm afraid, at the moment, we don't have any plans for an app for those platforms. Sorry.