I just read Deprecating the Observer Pattern and found it absolutely fascinating.
What's the status of the Scala.React package described in the document? I found one tarball of a snapshot of Scala.React but there doesn't seem to be much documentation or active maintenance. I also found ScalaFX, which looks like it might be related to reactive programming, but is similarly unmaintained.
Are there any projects out there that build on the ideas in this paper to create a GUI framework based on reactives?