These are two narrated screencasts explaining the main features of Rakontu 1.0 (which is no longer under active development).
Now folks, I'm not a professional talker, and these are only the best of many bad versions. Apparently the um and ah count is never going to go down very far. So be kind ;)This screencast is about three minutes long and is a very brief fly-over.
This one is about twelve minutes long and goes into more detail about lots of things.