A jar file containing Scala 2.9.2-compatible class files is now available in the Maven central repository. To make use of it, add the following to your build.sbt,
libraryDependencies += "org.lafros" %% "scala-either-extras" % "1.0"or the following to your pom.xml.
<dependency>Please report issues here.
Many thanks to Sonatype for providing their publishing service, and to Josh Suereth et al. for providing instructions.