Scala.Rx is a change propagation library for Scala, that provides reactive values that save you the hassle of having to keep mutable variables in sync manually. This goes into the motivation behind the library, shows off some cool demos, and hopefully persuades you that Scala.Rx is a useful tool in managing messy, stateful applications.
For more talks that I've given, take a look at lihaoyi.github.io/post/TalksIveGiven.html